Youtube & Monetarization

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Yes, of course. Don't you think PewDiePie and a whole lot of other people would have been sued by now if it wasn't? The developers have stated that they don't care if you make money off of Amnesia-related stuff as long as you aren't selling anything. Selling your custom story is of course illegal (until it becomes (if it becomes) open-source like Penumbra: Overture sometime in the future), but getting some ad revenue from your videos is not. You should be good to go.