is it normal for poker site to ask extra kyc only after final table cash

so i just hit a final table and actually cashed decent, then out of nowhere support wants a selfie with id, proof of address, practically everything but my dog’s birth certificate. never had them ask for more than the basics before, even though i've deposited and withdrawn before. feels weird they wait til i win something, like are they fishing for a reason not to pay? anybody else have this happen only after a big score, or is this just standard these days?