I’ve heard of FediMatch: https://github.com/Lypsilonx/FediMatch I have not used it personally - might one day though.

Can a reader user on Ghost follow multiple Ghost accounts? I haven’t used Substack but my understanding is that it is similar to Patreon and OF in that I can subscribe to multiple accounts and have them show up in a central feed. Can I do this as a subscriber on Ghost? And do multiple servers federate to allow for that?