[ftfish]

Great question, and I'll let someone with deeper technical understanding answer this, but using Wikipedia as a reference (1), it looks like "fediverse" is a bit loosely defined, with parts of it not being fully compatible with all of the other networks (2).

1: https://en.wikipedia.org/wiki/Fediverse 2: https://en.wikipedia.org/wiki/Comparison_of_software_and_pro...