Nope. Like everyone else you seem to have misinterpreted that.
"The CMA’s undertakings require the majority of practices to be amended by 28 February 2018, with a later date of 31 July 2018 for the implementation of prompts for consumers when they are playing with restricted funds."
There is presently no compulsory separation of bonus funds from cash. That's why Caddell and 32Red still do it I believe to name a couple. The word 'prompts' suggests a very different intention from banning them. If you read the article again, they admit they have no lawful power to decide which terms are unfair and that that decision is the domain of the courts.
I'm afraid like a lot of spiel the banning of tied deposits has been focussed on and the old Chinese whispers have created this belief. It will no doubt eventually happen, but not yet.
As for the first question, how on earth do I know how many users sign up to multiple casinos? Each affy programme simply gives me country, deposit amount and +/-. Identifying a similar player at multiple casinos is impossible as we aren't availed of that information. I can only surmise by confirmatory posts made by any sign-ups so very little definitive information is in my possession.
Actually most MT Secure sites do broadly have the same slots and set-up, with variations of loyalty (if at all) and FD bonus amount although nearly all are 100% to 100. There is a slight variation in wagering requirement which may or may not affect a player's decision to join, again that's speculative and cannot be answered accurately.
To take this to the other extreme, if ALL casinos stopped deposit-match offers, would ALL players stop signing up to casinos and stop playing, apart from Jono?