I want to like matrix, but I had to give up my homeserver. For reasons that are unclear to me I was added to the matrix.org homeserver blacklist, with no communication on why or response to my asking why.
Eventually I noticed some issue with the database, it having grown many hundreds of GB (something about my users being stuck in matrix.org rooms that they're blacklisted from, I guess) so I rm -rf'd it and that's that. :\