Force them to provide an openly accessible API to allow people to receive messages/event invites and send messages to the users of that platform. Then they can choose to use a different social network without having to give up their connections with people who haven't jumped ship. This way the advantage of the network effect of popular social networks will disappear.
Telcos have shown that there are ways to maintain network effects in the face of federation: ridiculous connection fees for users outside of your network.
I mean, I personally wouldn't. I don't think this is an actual problem, but in the face of a suggestion that "tech platforms are too big, ergo they must not be allowed a choice in who they do business with", I'll pick the "use anti-trust framework to make them not so big" option over "force a business transaction" any day.
Of course, those who make the "publisher or platform, pick one!" false dichotomy aren't really genuinely concerned about the size of the company. They just want to force someone to host their content, which is why they jump to "free speech means more nowadays than what it says in the constitution [so platforms must carry my speech]."
Sorry for the tangent, just want to make sure my position is clear.
> Of course, those who make the "publisher or platform, pick one!" false dichotomy aren't really genuinely concerned about the size of the company. They just want to force someone to host their content,
It is not nice to lump us all together. Many of us here both
- despise certain content
- while we still find it totally unacceptable that tech giants are allowed to do whatever they want with their power "because hate speech"
This is just a variant of introducing bad laws "because of terrorism":
The laws are bad not because anyone wants terrorism but because we don't want anybody to be punished without a good reason.
And today as tech giants wields more power than many courts or - in many but obviously not all ways - even small countries it might be time to make sure they have to be careful with that power.