[1]https://www.youtube.com/watch?v=h-t4lmHcXqw  Stallman Taler v
     Monero

   It's for people like me who have been living under a rock.  Casts
   Stallman as a little irritating here and there; he may have been a
   little tired for the video.
   Stallman has a lot of facts to back his opinions up.
   The starting TEDx video at [2]https://fsf.org/TEDx quickly explains the
   four principles of software freedom needed to prevent computerised
   population control, and how that is different from open source.  I am
   guilty of being scared to say "free", saying "open" instead, and hope
   to remember this ted talk a little.
   Stallman supports GNU Jami, previously called Ring, SFLPhone.
   [3]https://jami.net/ .  It appears to be a decentralised
   audio/visual/text communications platform using TLS 1.3 .  It supports
   multi-device linking, unlike many other decentralised communication
   networks.
   GNU Taler, [4]https://taler.net/, is a cryptographic financial network
   that protects full anonymity of the buyer, while also providing for
   taxability if needed while preserving this anonymity.  Contrariwise, as
   I understood Stallman, large merchants must operate completely
   transparently on GNU Taler  This moves power away from entities that
   gain dominance a little.  Taler does not use a universally stored
   permanent ledger nor a proof lottery.  (I think Stallman missed the
   point that cryptocurrencies provide to end network and storage
   censorship in a way dangerously otherwise missing in the technological
   ecosystem, but Taler seems a good thing.)
   After this it got more political around Monero, which Stallman hasn't
   spent much time studying.  He repeats his point that everybody is free
   to make whatever decisions they want; that that is part of software
   freedom.  I took the time to write up the above information as it
   seemed valuable to repeat, and didn't catch as much of the political
   parts of the video.  I do recall him saying that a report showed that
   over 10% of the world's wealth was held secretly by something like rich
   people avoiding tax regulations.  It sounds like I have some similar
   politics to him.

References

   1. https://www.youtube.com/watch?v=h-t4lmHcXqw
   2. https://fsf.org/TEDx
   3. https://jami.net/
   4. https://taler.net/