I disagree. It’s obviously wrong in the general case (e.g. look at note-taking or messaging apps), and there are all kinds of discussion forums with overlapping topics. Facebook, Instagram, Telegram, Discord, Mastodon and Twitter all have overlapping use cases. Maybe my view is colored by not caring about “the market”. But there’s certainly space for more than one micro-blogging platform.

I disagree with you. Facebook, instagram, telegram, and discord are all very different. People use them in different contexts for different reasons.

Facebook, Instagram, Twitter, TikTok, Discord, Youtube, Twitch all have specific niches in which they are dominant and cannot be unseated except through their own fault.

Messaging apps are a little more loose, I’ll give you that.