Moderation is the secret sauce of user-generated content. You shouldn't allow for user generated content if you aren't prepared to moderate it. It seems many people still don't understand that this is the biggest problem facing social media. Not scaling, not engagement, but moderation.
If we started with this approach from the beginning, we wouldn't even have social media or sites like Wikipedia. Enshrining it in law just means only the existing players can play the game.
How so? Wikipedia is a bad example as it is probably one of the most heavily moderated sites on the web. Social media is still 100% possible, it'll just be impossible to scale overnight as you'll have to scale moderation efforts with your username.
Wikipedia is heavily moderated, but primarily by volunteers. Do you think that would be sufficient if the Wikimedia Foundation was liable for anything bad that users might post? That’s putting a lot of trust in your community, and the consequences of volunteer moderators slipping up or missing something are pretty big.