You'd be better of security-wise looking for a secure alternative to the Yubikey, such as the NitroKey, Feitian, and some others. As long as their hardware is FIDO2-certified and the key has the capabilities you want (FIDO2, GPG, etc), you should be in business.
I used a platform called Aether which I used for a while but it seems the developer kinda abandonned it.
The idea was interesting, all participants would hold a copy of the network data locally and sync between eachothers (kind of like a blockchain, no it's not related to cryptocurrencies).
Writing a comment, a post, upvoting and downvoting required conputational power, which limited the ability to spam the network. There was the idea of having elections to decide who could act as a moderator in each communities (and the ability to impeach an existing mod), but it never came to be.
I have a knowledge rebuilding package, mostly in the form of the Kiwix (Wikipedia en full) archive and some other archives, as well as some other stuff like maps data from OSM. Next step is to buy a mobile device with eInk display with MicroSD support and load it there, to make it energy-efficient and that can be recharged using a solar panel.
It's only illegal if it's enforced
~ the rich