I’d recommend you sign up for their mailer. I don’t have the link off hand but it shouldn’t be hard to find.

Again, ghost is actively working on this?

So two things

Activity pub is federation. So you’d be publishing to anywhere. Which as I said before, ghost is actively working on. They have a weekly mailer.

If your looking for an algorithm publishing centre, your going to find open source to be lacking. Generally speaking people who are looking for open source, don’t want the algorithmic feeding that your describing.

I self host ghost but they do offer a hosted version. It’s open source as well. They’re even working on activity pub integration!