Similarly, there are many popular games who started as a mod for another mainstream title, gained support, and pivoted to their own independent game.
The scale is not comparable at all. 100% of artists hugely benefit from fan arts, while maybe 0.01% of modders of popular games benefit from their mods.
This is basically what I'm saying:
creator profit & no corpo profit = good <- this where people building upon opensource gaming projects are
no creator profit & no corpo profit = good <- this is where most of the modding for old/abandonware games is
creator profit & corpo profit = good <- this is where most of fanart is
no creator profit & corpo profit = bad <- this is where most of the modding for popular and live games like WoW and Minecraft is