My own Amnesia?

[Romulator]

I thought I read somewhere that you were allowed to charge for the download of a mod/custom story but with a warning that it's probably a bad idea since it would drive a lot of people away from it. Any sources on this?

The problem with that is that if you are using HPL2/HPL3 to distribute a paid product, you're kind of redistributing already paid content that isn't yours. I wouldn't necessarily call it stealing, but it isn't exactly "not stealing" either. While you own the assets and the right to create a custom story or modification, both of these require a base game to be installed (Amnesia: The Dark Descent or SOMA), which is all that should be paid for.

Jens while he was around did post this which deals with YouTube monetization. It defines what Frictional considers to be commercial use. Distributing a mod or creation and expecting profit from it using HPL2/HPL3 and their assets would violate what is considered commercial use based on that definition~