> should the internet should become a read-only medium?
Communication is the main strength of the web as a whole: trying to ruin it for the rest of us because the big sites can't be forced to disable their worst attention-seeking algorithms would be a gigantic mistake.
"Social media" is pretty much anything that lets you communicate digitally, whether that's a Facebook post, a chat message on any of the messaging services, a Stack Overflow forum post, or an in-game chat for a multiplayer game. Gaming is even called out specifically in an Ofcom report on adults' media usage (notice how it doesn't just say SOCIAL media). Demanding that these things be wiped out or locked behind restrictions locks away most of the benefit of the web!
The very best thing these people could do is to disable or delete their accounts on the big services (Facebook, Instagram) if they believe it's harmful for them. The rest of the world continues to exist whether they have a presence there or not.