I don't know but I think there is a room for compromise. If you post illegal things online and the site cannot identify you so that you can be held accountable then the site should be held accountable. As it stands people are harmed and nobody is liable so we end up in this situation.
There's a simple way to do that. Legislate a requirement for ID, the users will provide it to the platform, the platform will provide it to law enforcement when requested.
Kind of like how South Korea (where you need a national ID to access digital services) is doing, or the UK is trying to do with their ID push.
(And then who wants this could go have a fight with the people who don't want this.)
Speeding in a rental car doesn't absolve you of the ticket.
But I mean yeah, you could theoretically rent a car in the UK and kill somebody then flee to the US and hide. But don't let perfect be the enemy of good.