Ploum makes a very interesting point on his blog: https://ploum.net/2023-06-23-how-to-kill-decentralised-networks.html
They talk about examples like Google Chat being XMPP, becoming very big, changing the standards that look like other XMPP users/clients are subpar and then killing "federation" but no one complains because everyone uses their product, so it's not a big disruption.
While I don't think this is it, because Facebook is huge and ActivityPub isn't (XMPP was the most used protocol then), this happened and can't be ignored.
[offtopic] Where are you from, OP? Is it Eastern Europe? I don't think you're French, because you would have used « and ». But you used „ and ”. Come, tell me, is is Switzerland? Bulgaria? Russia? :)