[repolfx]

It's easy to write laws such that totally blocking automation is allowed, totally blocking human written content is 'censorship', and categorising/hiding by default/ranking content is allowed.

Yes, this doesn't deal with things like "is YouTube ranking biased" but it's a start. You posit that sites would be obliged to publish onslaughts, but many spam filters are pretty good at filtering such attacks. For instance that's where CAPTCHAs came from (there are better technical solutions than CAPTCHAs but you get the idea).