then they would go after literally anybody running a node

ACAB? Also, I'll get back to this

their client will not see peers on another IP. It will just see their own I2P node. Any I2P aware software will also not have any IP addresses as peers, only I2P specific internal addresses. They will not even be able to associate an incoming connection to any one node without understanding the I2P network statistics console.

And only people with similar politics to you will ever gain that understanding? Again, more on this

by this argument all anonymization tools should be illegal, Signal too, etc, and nobody should help anybody maintain privacy. In the real world there’s plenty of reasons why anonymization tools are necessary. And there will be literally zero evidence tying you to a crime. Preexisting legal precedence says an IP address alone is not enough.

And countries around the world are increasingly pushing legislature to make "anonymization" and "encryption" tools illegal (or at least require backdoors).

Which gets back to the politics aspect. Even among those of us who care about personal security (which, again, has nothing to do with torrenting but here we are), the likelihood of others to use it for nefarious and evil purposes is a problem. I've taught a few journalist friends how to use tor but I personally do not because that, and tools like i2p, tend to also be used for csam and I have pretty strong morals and ethics about not facilitating the dissemination of that.

And, as we remember once or twice a year, there are "hacktivist" groups out there who like to have a field day. And compromising tools used for the distribution of csam is something that many groups do.

But also? Those piece of shit cops and governments trying to get their fascism on? It is a lot easier to push for "extreme measures" when it is going up against pedophiles and child abuse. We saw similar with how the US (and other western nations) cracked down on immigration under the guise of "stopping the Muslims from doing another 9-11". And we are likely to see similar come out of the Israel/Palestine war.

MAYBE you get a really good lawyer so that you can get off on... Maybe you get a really good lawyer who cites the proper legal precedents AND a judge AND a jury who actually care about that. You have still had your reputation ruined for "being a pedophile" and laws are already being pushed to make using any of these tools illegal to begin with. And The People will generally support it because CSAM.

And getting back to "an IP address isn't enough": Yes, some judges have decided that. Was it Avatar that was the big case people like to cite? Been a minute. But that doesn't stop other judges who just don't give a shit about precedent still providing the subpoenas. And considering that getting the equivalent of a peer list requires "understanding the i2p network statistics console": There are likely to be additional "fingerprints" involved. I've not spend much time looking at said console so am assuming there is nothing as stupid as a mac address, but it becomes a lot harder to say "Old Lady Withers across the street was using my wifi".

Just because people are stupid and this is the inevitable drive by from the peanut gallery:

No, I am not saying that everyone who uses tor or i2p or whatever are pedophiles. What I am saying is that those are tools that are pretty notorious for being used to distribute and share csam. And while some people are okay with "Oh yeah, my private browsing of this website helped to mask child porn but I personally didn't look at or share any", I am not.