Imagine winning and you find it hard to pass KYC, trapping your money on the casino for like ever.
It's not always the casinos fault, I know some are dubious but the thing is KYC verification is something you should first deal with before making your first deposit.
Online casinos can be frustrating at times, some casino won't accept your submitted document even when you haven't make any deposit on the platform yet, so always confirm your identity first.
Submit your identity and wait for approval, do not be in haste to make deposit first, because the identity you submitted without a green approval from the team can still be rejected, take your time to get the passed approval first before proceeding with gambling.
I don't honestly know why someone would even bet on a site that requires kyc and they know they can't pass it. As soon as you send your money onto the site it's trapped forever. The worst part actually is if you win. Be easy if you lose to just go away but imagine winning huge and then not being able to pull the money off? That would be a nightmare.