XMPP is a protocol meant for building chat services; some of these others are chat services themselves so eg. it doesn't make sense to say that XMPP is not e2e

XMPP is a protocol meant for building chat services; some of these others are chat services themselves so eg. it doesn't make sense to say that XMPP is not e2e by default (of course it's not, it's a protocol which may or may not be used to build an e2e encrypted chat service). Maybe that should be changed to "Jabber" which is what a lot of people call the public, federated network of servers built on XMPP these days? (The term has all sorts of other historical baggage and some people use XMPP/Jabber as synonyms, but mostly I think people use Jabber to refer to the public network these days and XMPP to the protocol, rather like email and SMTP).