Well, personally I do NOT send in my info. However, these days I can usually end up getting away with it because I am a known entity in the industry.
I have, though, in the past refused to send in winnings and forfeited $3000 becaue I worry about identity theft.
I know a few of my players have too.
Even if you trust the casino itself, that doesn’t mean you can trust every employee. When you are done proving who you are, they have absolutely everything to impersonate you with.
I find it unacceptable.
Some casinos do it just because of bonus abuse.
Then make the bonuses sticky.
Or give people an option to get a loyalty bonus sometime later – without wagering requirement and ID request. I bet a lot of people would take that option if it was presented to them.