I thought about this recently with Instagram, when I got linked there as the 'official' information page for an event. I could see the post with the general information, but couldn't read the comments to see if any more information or clarifications had been posted.

That was an event, where the organizers obviously wanted as many people as possible to show up, and Instagram was doing them a disservice in that. I wasn't going to sign up to Instagram to view those comments. And my parents couldn't sign up to Instagram. It's too complex for them.

Twitter has been gone for the non-Nitter using general public for a while. So, at this point, if you're not a techy, where can you still publicly post information? TikTok, I think? YouTube, I guess. Mastodon would be an option, but it's verging on being too unknown for non-techies, as does BlueSky.

We've gone from a time where everyone and their mother could publicly announce things on the internet, to a pretty big vacuum.
It's going to be interesting what fills this space. Theoretically, even personal webpages might have a bit of a comeback.