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Would something like GNU potentially work for the Fediverse?
(www.taler.net)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
Potentially, maybe. Taler is centralized and has poor privacy protections, but if it ever takes off it might become a good option in jurisdictions where decentralized currencies are illegal.
Meanwhile, Monero already works for the Fediverse:
https://deadsuperhero.com/the-fediverse-and-content-creation-monetization/#honorable-mention-mitra
This is non-sense. It's not centralized at all and the privacy protections are excellent, just designed to different specs (privacy for buyers, but not sellers).