Git is decentralized, but services like GitHub/GitLab/Gitea/SourceHut are adding things like issue board, pull requests, planners… Those are historically only on the platform and it needs to be decentralized too, because not every project wants to use biggest platform like GitHub or host something themselfs, while contributors and users don’t want to have multiple accounts for multiple forges.
Matrix is getting better on fast peace, we need to give it another yew years to fix biggest holes I guess.
ActivityPub based chat is going to suck much. Like basing chat on RSS or FTP, it can be done but why. Unless we’re talking just about replicating Instagram-like DMs then maybeee? But I still would like to just add link to Matrix in bio instead of having chat in yet another place.
I think having your own store you control, like with WooCommerce, is enough.
What we need is more freedom respecting payment system and the closest thing I saw someone is working on is GNU Taler.