I'm pretty sure what's going on is that casinos are constantly looking at how players are making withdrawals and then changing the rules so it doesn't happen again.
It's kind of like evolution.
This is the problem, they are looking at strokes of luck, then implementing a term to combat it. This is why so many excluded games and other restrictions make no sense at all, the casino has responded to a stroke of luck that has given a player a very substantial withdrawal. Perhaps one lucky sod hit a 5 reel wildstorm, so Thundrstruck II gets restricted, but not Immortal Romance.
However, this is not how casinos should be operating, they should accept that some players will win because they got lucky, and they should not be running around tweaking the terms to stop it from happening again.
Assuming that they won't actually enforce a crazy set of terms is a dangerous approach, because they can enforce them on a whim, and do YOU want to be the player that has just had the wrong win at the wrong time that leads to them exercising their discretion and voiding it, and then saying "it's in the terms, you should have read them".
Players have to assume that all terms, no matter how crazy, are there with the intention of them being adhered to, and enforced if they are not. So, a casino should be judged by the terms it publishes, not by how they are enforced. Rogue terms, whether enforced or not, mean a rogue casino that should be avoided. Casinos should only have terms that they are prepared to enforce. Currently, casinos rely on the fact that most players do not read, or if they do can't understand, the pages of exceptions and exclusions to an already complex and convoluted set of conditions. This allows them the luxury of selective enforcement because if they haven't been enforced, a player probably has no idea they have been dicing with confiscation for deposit after deposit, and we often see cases here where players suddenly find a big win confiscated for doing something they have always done before at the casino without encountering any problems, warnings from support, or confiscated withdrawals. This often happens when they hit the "life changer" win, and the casino decides it's time to enforce the terms so that they don't have to pay up.