That's true that you mentioned some signs which can address somebody to be at least high risk problem gambler (sorry, you asked that i assumed your case was about problem gambling and casinos responsibilities when was reading that link CM added in his post, apologies if i was mistaking), and casinos are really following player behavior from their different reports, many including to these things you mentioned, loads of deposits in short time, time spent online, cancelling most of withdrawals and other marks which could be red flag for problem gambling. Many operators are closing players accounts if playing is getting really extreme, but it's not that easy to just simply decide that one have so severe problem that self-exclusion or closing account is only thing to do, what then if player is coming back and demand to get account opened?
UKGC have already gone more strict and been giving some quite big fines for casinos for failing to fill their social responsibilities with responsible gaming, MGA expected to follow that route as well, dunno how strictly and when we see something really start to change, but quite surely it will happen sooner or later.
UKGC ruling which is discussed in at least few different topics, is not really clear, i bet most of casinos would be really happy to receive exact ruling to follow when it's coming to money laundering and responsible gaming, but as long operators don't really get much support how to bring these things to their operations, it's quite much grey area when to do what and some operators are more strict than others and many totally lost in these rulings. At least some (sorry to speak just some operators etc... but can't know all of them, just some what i use or somehow know) operators are already carrying out Source of Wealth checks for players under MGA license, which information can be used to recognize possible money laundering and problem gambling. All players are not happy at all to share quite sensitive information like their payslips, bank statement transaction information and all documentation which is needed to understand players economical situation and where money is coming from. Even that is not bullet proof like anything else, player can post proof of winnings from other casino for part of it, but there really is no way to know if it's spent already, how many casinos player is playing or is some money showing bank statement actually meant to be family savings or what ever.
As we came to conclusion that we all can get addicted to different things, i don't really see that casino operators wouldn't already now carry more responsibilities (what you mentioned are not helping) than places who sell alcohol for people they know to be alcoholics, strip clubs who are happy to take every single coin from your pocket when you are already actually sleeping there, computer game providers who can see that one person is playing online extreme amount hours daily etc....
I would say that for casino operator, players life time value and retention is more beneficial than some problem gambler loosing big bunch of money in short period, there are players who play more than your mentioned 30€ monthly but still not more than can afford and keep it fun, when starting to get fully in that fun called SOW checks where you have to open all your financial details to casino operator what you wouldn't like to share with your friends or any people in the world, it will quite surely help to see that one is playing what can afford but if you have seen some posts from this and other forums, for many it's pain in somewhere and not willing to do that (It can feel that it's easier to get mortgage from bank than proof your SOW to casino as at least some topics showed here), minority of players have bad addictions and hopefully recognize it themselves, casino operator can't easily follow up everything in real time but losing fast is very easy and if your account get blocked, you find Bonanza or what ever is your favorite game from few hundred of other sites. UKGC and MGA are moving to self-exclusions which are taking effect for all casinos under their license, but does that make problem gamblers spend their money to some rogue casinos under Curacao, Costa Rica etc... licenses where we all probably have seen stories that players rights are quite much worse than in Europe (not all of them, but there you hear more stories where you don't see your winnings and some quite horrible T&C:s with small maximum payouts etc...)?
What you mentioned about customer support, it's quite tough demand that operators would start to hire psychiatric educated persons there, probably not really big pile of CV:s if you add that to needed education. They do assist you how site is working, about ongoing promotions, escalating possible technical issues or if your payment haven't reach your account and many other tasks. Many operators have quite clear instructions to support to escalate also possible problem gamblers to relevant department if player is mentioning about playing too much, played rent money or shows other clear signs, then you will most probably be contacted and ask that you are ok and be offered limits, if you can't agree that you might need some limits, it's quite heavy decision for operator to bank some player because "We thought you play too much...."
Really hope that it would be that simple to build system that nobody don't get harms from playing but that's kind of hard call. If you think that you can easily solve that problem without ruining fun from "normal players", i bet you would be quite wanted to work in most of, especially very big operators. Point just is that many things have been tried players are risk followed up but that magic haven't yet happened that all players with problems can't be helped by operators as can't other addicts, it just for many takes to get very deep before willing start to help him/herself.
Last point about make slots more fair i don't really get, all of them must have clear rules, RTP and other information which have to be accurate, not sure how to make them more fair, but that's not really up to casinos but game providers and when you look games average RTP:s, there might not be much space to make them higher and still run business with all it's expenses. Playing online is not good for all and can cause big problems, drinking is not good for all who can't control it, could carry to this list quite long....