Modern casino slot machines often are networked/able to talk to remote servers so much like online slots they are alot harder to compromise. The scam Flatzem mentions is cool.
There could be a variety of reaosns why they have concerns(ie loss chasing because of your immediate trying to take out your second deposit plus profit).
As Afi says above websites(casin/businesses) will generally keep your details long after you have deactivated/closed your account for compliance reasons.
I wouldn't mind seeing them reviewed too but I do note they got rid of their 500% deposit bonus and theres warnings of them elsewhere with deposit terms that are unfavourable for wagering(playing low risk slots to clear bonuses etc)
I don't mind the reality checks telling you how long you have spent/wagered but I don't like the way its going(ie enforced maximum session lengths/cooldown times/autospin removal etc), like if I am wagering a bonus at 20c I will happily let it spin 10hrs during the day checking on it every 15-20min and not paying attention to it and that does not mean I've actively playing the slots but casinos consider it as if you are.
Theres a difference between someone jumping between slots/betsizes etc in a session and someone grinding out a deposit bonus after a big win to get the best RTP possible etc. New regs/restrictions are making it harder and harder to get the most cash out and instead players might be restricted to no autoplay etc and are now betting $2 etc to do it within the timeframes allowed etc and bust their balance instead of getting a near certain cashout.
Yeah not much you can do other than asking support, it's in a casinos interests to stall/extend that timeframe so you cancel and lose the money. Vote with your wallet, play more volume at casinos that don't stall.