Well, it&#x27;s all about plausible deniability. The people who run these sites know that minors are using them, and it would be cost-prohibitive to make it really hard for minors to use them.<p>So, instead, embed some text in your ToS and pretend to act shocked whenever confronted with direct evidence that people aren&#x27;t complying with the ToS.<p>It&#x27;s the same for porn. An &quot;are you 18?&quot; page isn&#x27;t going to stop anyone, but it shifts the blame from the publisher to the consumer.