Why use ActivityPub when RSS still exists, and when IndieWeb adds social functionality to traditional, non-ActivityPub blogging?
Even at its best, ActivityPub is a very difficult standard to implement, with a lot of really hairy edge conditions and an at-best-mediocre experience for things that don’t fit neatly into its model, and Mastodon’s particular implementation of ActivityPub isn’t, y'know, great. (And I’ve written a bunch more about my thoughts on this as well.)
Basically I’d love to see more people support IndieWeb, using RSS/Atom and ideally also
h-feed as the syndication formats, and to that end, I’d say that micro.blog is a better choice of “new Google Reader.”