I ran a server for a while a couple (maybe a couple of couples) of years ago, and client devices periodically disconnected and had to be re-setup / re-authenticated from scratch, losing the chat history and being a general hassle. It happened often enough that I got jack of it.

I like the idea, a lot, but the implementation at the time annoyed me away from it. I just don't have time / motivation at the moment to have another go. We ended up on Discord for family communication and it works well. I know Discord is on the lower end of 'one of the bad guys', but for the same reason I don't re-setup Matrix I don't move off Discord. At least it's not WhatsApp...

I did try to get them onto Signal, but I don't think Signal did group chat back then - which means it must have been before 2020.