I have one regular practice, and that is to always hand out my kyc documents for verifications immediately after my account creations, this help me to overcome alot of stress along the way since i dont know which casino i have the luck of hitting my first 1000x multiplier that make me the jackpots winner and want to withdraw on $100Ks without problems.
So for sure anyone can do that as long as you have nothing to hide and you trust the casino, making sure you give your documents to only reputable casinos, this will definitely make alot of sense solving all this KYC issue's.
As others also suggested, that's a huge no. What if it's a new casino, or isn't trusted, or who knows that else? If they want to scam you out of your winnings, they'll do it whether you submit KYC beforehand or not. I personally wouldn't be comfortable doing it. What if you don't end up liking the casino? You've submitted your KYC documents, and it can't be changed, nor will your data be deleted. The majority of cryptocurrency casinos do not require it straight-up from sign-up, thus, there's no reason to submit them immediately.