There is one project (tinode/chat) that lists xmpp (topics/xmpp) topic in an abusive/spam manner, as in the project description they explicitly state:
Tinode is not XMPP/Jabber. It is not compatible with XMPP. It’s meant as a replacement for XMPP.
The issue was brought to the attention of the owners (https://github.com/tinode/chat/issues/519) but they just ignored it…
Is such behaviour OK?
(sorry for the lack of links but there is a limit here)