I thought so too, but then I tried reading the activity pub specifications and decided that I didn't want it so badly after all.
@qrstuv I mean, no one needs it, but it could be an amazing tool for many thousands of artists of all kinds.
If someone were to make such a thing and give it away for free, I wouldn't object and might consider using it. But I've discovered that writing an activity pub without receiving a pile of money in return isn't my idea of a good time.