They do, but unlike what the OP claims, you do not need to age verify your site just because you added a social element. If the purpose is not to distribute pornography/other age restricted materials and you are able to moderate the site (ie: are not facebook scale), this is not required.
The law sucks but the misinformation around it is getting out of hand.
So if a site is completely p2p, it's illegal because it is unmoderatable?
No. If you are operating a p2p video chat site that is accessed by minors and you have no way for users to block or report content, then you are indeed going to face issues.
If a user is downloading a Linux image via bit torrent, or using WebRTC data channels to synchronise many clients using a p2p mechanism, what is the risk that needs age restricting?
This is what I meant, the OP is factually incorrect that just adding P2P technology to a service means it must age gate.
And if so, is BitTorrent also completely illegal now, even if there's no piracy? IPFS? I2P? Tor?