Also, *.itch.io is on there. That's a popular site for hosting and selling indie games. Seems like an odd thing to blacklist.
There are some pornographic games on itch.io, and maybe the list publisher has an issue with that, but nexusmods.com and loverslab.com and a number of other major mod sites that host pornographic mods are not on there.
All communities ending in "Moe" are blocked, so that's presumably aimed at stopping sexed-up underage manga stuff.
Politically, a lot of auth-left (tankie) stuff is on there, but so is conservative stuff, communist stuff, libertarian (probably right-libertarian), and anarchist stuff.
4chan is blocked.
The (controversial) archive.today family of sites, which are mostly used to bypass paywalls, is blocked.