In regards to the reuse of game assets for free mods/skins in other games, is this allowed under company policy?
I should note the Garry's mod community does this all the time and said noncommercial/parodic reuse of assets is considered to fall under fair use law by this community.
Possible uses that definitely fall under fair use include:
Using game models in Garry's mod as a freely available model.
Using game models for non-commercial mods for other games such as Bethesda games and Source engine games.
Using game models in free non-commercial fangames.
Using game models in source filmmaker/blender/other software to make fan videos.
Offering the models for free use in a 3d virtual world such as VR chat.
Any other use that is non-commercial or otherwise parodic, and thus falls under fair use.