My problem is not with you asking for documents. I totally get why it's necessary.
The two main issues I have with all this is:
1. This takes way too long. This should take days, not weeks or months. You accepted the deposits, now accept the withdrawal. Unless you can prove that some crime has been committed, then it's not acceptable to hang on to someone's winnings for this long. It's totally out of proportion, because we know that in 99,9% of these cases you find nothing and eventually pay.
2. The player can still deposit and play while being unable to withdraw any winnings. Seems totally fair and legit. NOT.
Somewhat offtopic, but I once had a casino investigate me for no apparent reason. This was way before anyone knew anything about SOW, so it wasn't that. However the one thing I was the most disappointed with was that there was no communication from the casino. I had to chase them constantly and ask what the problem was. After about three weeks of document requests and silence from the casino my money arrived magically into my bank account. No explanation, no communication whatsoever from the casino in those three weeks other than requests for more documents. No sorry it took so long. Nothing. Guess if I've ever deposited at that casino after that? It happened 6 years ago. Just a heads up Casumo, players remember when they've been jerked around and most likely will not return.
Anyway, back onto topic. Haven't deposited and played at Casumo in over 5 years. Seems like I didn't miss much.