Yeah, I finally pulled the trigger and moved to my own domain from matrix.org. Man, it is just so much faster. Which is sad, because the performance is pretty bad. (Element Web seems to do some per-room request as part of the initial loading screen which is obviously not scalable) but getting off of matrix.org is a huge performance improvement.

That being said there is nothing really wrong with matrix.org. The problem is really public rooms. People will join and spam. It is true of any protocol (have you heard about email?) but Matrix definitely needs to (and they are slowly working on) make it more expensive for spammers.