Would a site be willing to take the risk on accepting a blatantly doctored ID? The consequences for allowing an underage performer on the site are extremely severe. Decades in jail labeled as a pedophile and spending the rest of your life on the sex offender registry.
It's no surprise at all that the sites demand an extraordinary amount of PII about the performers before they are allowed to post a single image.
Shame the punishments for leaking PII are nowhere near as severe.