Onto the domains of those specific ones however:

https://asguardianacademy.forumotion.com/ doesn't seem like something too big

https://www.codeweavers.com/ seems reasonably big but has good content (in specifically https://www.codeweavers.com/compatibility )
media.codeweavers.com archived in 2014 https://archive.fart.website/archivebot/viewer/job/201410120207452mclh 

https://www.mobygames.com/ seems big but https://www.mobygames.com/forum/ seems manageable
https://www.mobygames.com/game/* where * represents a specific game has been archived a fair bit by AB; no full archive of the domain

https://www.neoseeker.com seems huge
https://www.neoseeker.com/forums/ seems quite large with 33 million total messages
https://fanart.neoseeker.com/ archived in 2020
https://www.neoseeker.com archived in 2020 https://archive.org/details/archiveteam_archivebot_go_20200213200001 however I don't see https://www.neoseeker.com/forums/93337/t2330965-brand-new-game-ultimate-difficulty/

https://www.nexusmods.com/ seems very extensive but with lots of interesting content
https://www.nexusmods.com/ and https://forums.nexusmods.com/ both archived in 2014 https://archive.fart.website/archivebot/viewer/?q=nexusmods

https://www.gog.com/ is also very large. (https://www.gog.com/en/games?priceRange=0,0 would be downloading a nice quantity of free games & dlc)
https://www.gog.com/forum has a large amount of forums with a lot of save-page-now archives but definitely no way it's extensive 
https://support.gog.com may lead to a lot of information but with no signs of shutdown, *shrug*
gog.com archived in 2022 https://archive.org/details/archiveteam_archivebot_go_20220616112140_7eaee48d