EDIT (2023-07-31T22:18:52Z): I have realized that I was not clear in my original intent for this post – it could be interepereted to mean that I am asking whether or not you could access, for example, Lemmy through the Tor browser. This is not what I meant. What I was more alluding to was if it were possible to create a sort of “hidden fediverse” that was separate from the fediverse over the clearnet. There exitsts, already, Dark Web forums, like Dread, and I wonder if those would benefit more from being federated – Lemmy seems like a good candidate for this.
Title changes: Added “More specifically, could one make a sort of “Hidden Fediverse”?”
Instances with public domain names could successfully federate with onion instances, as long as it’s capable of accessing both networks.
Onion instance talks to the public instance through an exit node, public instance can reach back to the onion instances through its hidden service.
But that doesn’t remove the requirement that both ends needs to be on the Tor network, but at least one end doesn’t have to have an onion address. And obviously, the onion instance will have limited ability to interact with non-Tor-enabled instances, and one of them being public renders the usage of Tor somewhat moot.
That’s pretty much exactly what they said.