People warned that this would happen when Facebook (YouTube, Steam, etc.) started sliding in this direction.
And years before Facebook was even created, a middle way was also proposed where a carrier like Facebook wouldn't be legally responsible for the content they carried, unless they started to select and/or moderate that content, at which point they would lose the carrier status, becoming a simple broadcaster, which would be legally responsible for everything that they would help to broadcast.
And years before Facebook was even created, a middle way was also proposed where a carrier like Facebook wouldn't be legally responsible for the content they carried, unless they started to select and/or moderate that content, at which point they would lose the carrier status, becoming a simple broadcaster, which would be legally responsible for everything that they would help to broadcast.