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This is true and public knowledge though as I said (details seen here in the “Steam Key Rules and Guidelines” section), if anything Valve is giving devs a lot of leeway by allowing them to do that at all, not only are they giving up their 30% cut but are also then distributing and committing to updating those copies of the game for free
The allegation says nothing about steam keys. The lawsuit is alleging that they are contractually prevented from selling the game cheaper elsewhere.