I can imagine, that a #Jabber client with focus on #privacy would attract some users. Probably not me, as I care more about #convenience and #digitalSovereignty 😉
Such a client would have to do the same things as Parakeet, but also needs to have #OMEMO2 to encrypt more data, mandate use of #proxy for HTTP Upload and Jingle, and probably more.
#XMPP is designed in a way that you have to trust your own server to a certain degree, but not other servers or contacts.