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You would probably need to credit the specific asset artists, which might be tricky if you're using the generator. It's also probably not ideal, as lots of assets are edits to graphics ripped from existing games. It's a bit of a minefield either way. I'm no lawyer, but I would personally advise against using these assets in a commercial product.
Is there some sort of list of the assets that aren't taken from games and that can be used without stepping on one of the legal mines out there?