I really appreciate the links! So it looks like matrix has mainly been focused on the chat room side of things and another downside is that you need some sort of translation layer to connect a matrix thing to an activity pub thing. Definitely gives a lot to think about. I’ve been trying to decide where I should donate my time to doing dev work at but the answer appears to be “it’s complicated”
One of the problems with the fediverse is that each server keeps its own copy of the content. It is definitely a worry that bad actors push content to federated servers to get them taken down due to the content they now are storing.