Nothing like a little bit of corporate sabotage!
The software developers who created Lemmy openly criticize systems of government and economics. These are nation-state battlegrounds too. The barrier to entrance is very low, as Lemmy doesn't even do routine tracking of account creation, rate-limiting alone isn't really defensive. 15 years ago sites like Reddit had major vote manipulation detection logic behind the scenes. This is pretty much unleashed playground for a lot of known tactics.
The federal governments of several nations should be in pursuit of this, and IP addresses and specific time logs shared.