As those policies are enforced client side, an industrious person could probably see how it works and do whatever. I can’t seem to trigger any age verification to see, but if it works in a web browser, you can pretty much rewrite everything about it and make it upload whatever you like.

Sy far the only ones I’ve seen are scenarios where I have to upload photo to match my appearance when I show up in person to something, so it’s not useful in that context, but I’m suspecting this scenario is similar.

The counter argument could be that if a person has that ability, they are probably close enough to being an adult and/or have earned their technically illegal access to porn, and the site operator made a good earnest attempt that stands up to casual lying.