@VintageGenious Think about it this way: an email client can do both Gmail and Hotmail (and Fastmail etc.) because it’s all just email. The same goes for the Fediverse; it’s all just ActivityPub. For example this reply is from a Mastodon app :D
I have personal frustrations about how popular servers like Mastodon and Lemmy hide ActivityPub. I feel progress is stifled. Enough that I wrote my own ActivityPub service (https://apubtest2.srcbeat.com/apas.html)