And why couldn't a giant company decide to own "a more fragmented landscape of specialized services"?
Twitter has it even worse - their whole schtick is a huge chattering town hall. Advertisers and brands want this, users increasingly don't.
I tried to express this in a blog post[0] but the gist is that in their quest for engagement the big social media networks have evolved down a path that is not as attractive to users. The environment (the internet using population) is changing but the big social networks cannot change to meet new needs without ditching the things that make them money.
[0] https://sheep.horse/2022/11/social_media_is_not_dying%2C_yet...