Legal questions about assets

Can someone help me understand what are the conditions for publishing/using assets for s&box? I haven't found anything or any Q&A about it. 
- Are ported assets from other games allowed? I have seen a lot of people port them for a while so is it fine? 
- Also when I am making gamemodes (not standalone games) can I just indiscriminately use every asset I find? There are no restrictions or anything so I am not really sure.
- If my gamemode applies for the play fund, does it change anything regarding its use of assets?


There really should be an FAQ about this tbh.

Hi. Some random guy, here. You definitely shouldn't use assets from other games. You might get away with it in a non-monetized game in the short term, but I can see Facepunch enforcing that shit in the future. Especially with monetized games as that is against the Play Fund rules (and the law too, I guess, if you're into that kind of thing).

As for the Cloud Assets, author permission is "implicit" so go wild. BUT be careful as there are copyrighted assets on there that obviously do not magically become free to use. In time I expect they will be removed. Play Fund rules (and most other needed info) can be found in the docs:
https://sbox.game/dev/doc/about/getting-started/monetization/

Yeah, this question flew through my head multiple times.
Currently working on a level and trying to use as much as possible of the dev. materials, just to be safe from copyrighted stuff, hehe!