@HistoPol @smallcircles

Sweet! :-) For those who do not know, XMPP is a protocol (similar to the ActivityPub protocol being used by various fediverse services) that has many client applications. I can't think of any proprietary clients, though one or more may exist somewhere. XMPP actually spawned from Jabber (the protocol Google Talk originally used), and it is generally used for instant messaging style communications. It has the ability to include media, and can be end-to-end encrypted with [most commonly] OTR, OMEMO, or PGP.

Jitsy on the other hand is a little more complicated, and in fact includes some XMPP interoperability. It has video conferencing services similar to what you might find in Teams or Zoom. It is open source, and can support end-to-end encryption when using a Chromium based browser.

Both XMPP and Jitsy servers may or may not log IP addresses in the same way a web server like Apache or NGINX does. Though I imagine if that were added to the list for them, it would need to be added to the list for all of the others as well. Unique identifiers such as email address and phone number are simply not required for using either, and I am not aware of any XMPP or Jitsy services that have any advertising.

Thanks for making the chart and if you have any other questions, do please let me know. :-)