Comment by The_President

Trusting your chat activity and availability to any XMPP server on the internet that allows free public registration is not ideal. If you want reliability then pay for it or use what you perceive as a highly credible free server. I do not run any public facing XMPP services so I do not have any input on that and as with Matrix I wouldn't roll your own unless you know exactly what you're doing due to inherit risks associated with these platforms in certain states of configuration or exposure.