Hard to pierce pseudonymity doesn't interest me that much, because it's bad enough having all your posts connected together.

I want something like 4chan (but heavily moderated), where all posts are just marked "Anonymous" and if you make 3 different comments, it's not publicly shown that they came from the same person. It's ok to retain the info privately for a short period, for moderation purposes. It could be ok to assign a persistent pseudonym for each thread, so if you comment 3 times in the same thread, those comments are connected to each other, but not to other comments in other threads.

This is a good article about the attractions of completely anonymous posting, though it's from the pre-supertoxic internet era: https://wakaba.c3.cx/shii/shiichan

How would it federate? Both in and out.

I would be too lazy to, unless I eventually encounter my 'gateway drug' to i2p.

So, will it be a separate social network or a part of the Fediverse that will be able to communicate with the others?

My main concern would be usability. i2p usually has lag in the hundreds of milliseconds, which would make something full-featured like lemmy kind of a pain I think. I'd imagine it would be so slow

My concern would be federation. I don't think the fediverse is set up so you can run the same service on the clearnet and dark net.

Probably not. I2P is a pain to set up, for little benefit other than a decentralized network. The latency is not worth it currently.

When it becomes click and install, and the latency is improved, then maybe.

Everything will be allowed except for moderation regarding serious topics and spam.

So you're making a Nazi bar

Are people actually using I2P?