1- Would you gamble at a crypto-casino knowing it would ask you for KYC documents before withdrawal?
My opinion: No, because fiat casinos offer much better services, odds, and games so I would never want to do KYC at a crypto casino and if I was going to do it, I would rather play at a fiat casino like bet365. There are countless options of exchanging your Bitcoins to skrill/neteller and deposit to play. I don't think that's a problem for anyone so unless crypto casinos offer better services, I won't play there if KYC is required. On top of everything else, the main reason why crypto was made was to keep ourselves anonymous and if crypto casinos should follow the same path.
If a player cheated the casino by any means, then the casino should just ban the player because asking for KYC is not going to solve the case.
2- Do you feel safe giving out your KYC to online crypto-casinos?
My opinion: After the documents are sent, they go through a number of people and online casinos keep changing their staff from time to time and in some case, if a staff member knows my address and in case I am a high-roller I would be in some serious trouble because the staff member can track me and even blackmail me to some extent. I am ok with giving my identity to known sites like bet365 or williamhill but I am still not comfortable verifying myself at a lesser-known crypto casino.
Tbh giving your docs for KYC to crypto casinos is the same as giving docs to crypto exchanges. Nothing bad will happen. For my part, I can offer 2 casinos where I still have not received any KYC: Thunderpick and Stake