I personally prefer KYC at the beginning rather than having to KYC after wanting to withdraw big wins, it will be more complicated.
I get your point but it's not usual for a gambler to be willingly open to comply for the kyc, upfront. Because many of us are hesitant and wants to remain anonymous while playing especially if you're just an average gambler. But yes to avoid issues I think this is not bad, since you're fine with it.
but i do KYC early usually at a reputable casino here and Rollbit one of the good reputable casino. so you don't hesitate to do KYC at the beginning and are more comfortable when you are going to withdraw large funds without asking for KYC again.
This is important to only choose the platform where you'll submit your personal information and documents. It should be the one you trust as reputable and already established. Less hassle since you don't have to do it again incase you really did win huge amount.