Many state bodies involved in adversarial action have dedicated budgets for offensive cyber-warfare, credential thefts, supply chain compromises and disinformation. If they haven't used all of their budget by the end of the budget period, they'll be allocated a smaller budget for the next budget period.

That's an interesting stress test for I2P. They should try to fix that, the protocol should be resilient to such an event. Even if there are 10x more bad nodes than good nodes (assuming they were noncompliant I2P actors based on that thread) the good nodes should still be able to find each other and continue working. To be fair spam will always be a thorny problem in completely decentralized protocols.

botnet owners dying typically come forwards and say they are trying to run a botnet, so there may be some difficulty there.

botnet owners don't typically come forwards and say they are trying to run a botnet, so there may be some difficulty in detecting them there.

Discord has a lot of terrible servers. This is one of the reasons they were not trusted when they came out and wanted to do identity verification. They already have a lot of information yet fail to do meaningful enforcement at scale.

There's servers where they just hang out, but which themselves are legitimate. Cybersecurity related ones etc. You can ban them and they'll just switch to another account within a minute. Occasionally discord or a server owner does, but everyone knows its pointless. There's probably other servers that are mostly used by cybercriminals, maybe command-and-control backups, and security researchers may stumble upon these when taking some malware apart, join them, and end up getting in contact with the owner.

In general I don't think law enforcement wants discord to take these down or ban them. These guys would have no problem to just make some IRC servers or whatever to hang out on instead, which would be much harder to surveil for law enforcement - compared to discord just forwarding them everything said by those accounts and on those servers.