No one has mentioned the other side of this. If Pornhub (AgeID) doesn't like your competing site, they can refuse to sell you their software. If the other couple verification companies don't like furry porn, suddenly you can't get age verification software and nobody can use your site. This is an excellent way to push unwanted sites offline. USA does something similar by asking payment processors to refuse services to sites it doesn't like. Those sites die quickly.