Given the US recently made a bid to fast-track multiple censorship bills, KOSA included, and is also trying to kill Section 230 now, which will pose an existential threat to Fediverse instances hosted over the clearnet, how feasible would it be to host said instances over Tor/I2P?
From a technical pov nothing is stopping it. Tor addresses are valid domains names and you can run your own fediverse in those networks. The problem becomes when you want clearnet instances to send you content. As they aren’t running in tor or i2p they can’t send you stuff.
The other problem is exit nodes are fairly well known for being the source of bad shit and many instances will block them as part of their anti spam/bot setup
A server can run on both the clearnet and darknet simultaneously, but indeed I don’t think that works that well if the server name is the identifier for an instance — since it would be different between the networks.