Some people are just spiteful shitheads. Also, there’s been a bit of a wave of DDOS attacks against US-registered sites lately- Archive of Our Own, a fanfiction website, got DDOSed a few weeks back. Seems like they’re going after any site that doesn’t have good DDOS protection and is based in the US.
If that’s the case, I figured it was “Marxist-Leninist”, which is what most of them prefer to describe themselves as.