For example, I made a Doors fangame. I know it’s not allowed to add assets from the real Doors game, (you can’t add the same assets), but then I find a Doors map free model that I’d like to use. The problem is : it uses the same assets as in the real Doors game! The seek eyes are the same, the map is the same, etc…
So my question is, can I use this free model in my Doors fangame?
Well, the sad thing about this is that ROBLOX won’t care as far as you’re not a popular developer and your staff got leaked.
However, since you’re trying to use assets from a really popular game, there is a 100x times higher chance of getting the game taken down by moderation or receiving some account restrictions.
Make sure to credit the original creators, experience, etc. for every asset you use in your game, and It might work If you don’t plan to scale big on the platform with your experience.
In my personal opinion, I would never risk it, maybe only use it for some training in a studio (scripting, animation, etc.)
I hope this helped you!