I was a teenager and the option of not watching it would never have occurred to me. The idea that people accidentally stumble across it and then get hooked is laughable.
And I don't mean adult media uploaded to sites which serve other media, I mean bespoke adult sites. You don't end up there by accident. Anyone who goes there and sees the splash screen will just open another tab and go somewhere less restrictive.
And go where? If California does it, the EU will be close behind. Good luck have exponential turnover if all the highest GDP counties gang together. Almost like a union, a European union, as it were.
https://xkcd.com/1357/