What stops indies from using illegal software to build their games?

Ahah nope for sure. Especially that some softwares aren’t that much expensive…

But I still have a question about this. If you sell a modified file you sure can be caught. But how does it work with files used in for example Unreal Engine/Unity/CryEngine etc ? I mean there is no .fbx/.obj or whatever “classic” files in the game folder.

It’s very interesting how they hide proofs in the files like spies ahah