No, Steam would want their cut of the sale of the game for access to all of their features, so it would cost the developer money to give away a steam version.
Not saying I expect to get a Steam copy, I bought it on epic with the expectation that I was only buying it on Epic and people shouldn't hope for more. But, free-to-play games are a thing and as far as I know Steam doesn't charge for distribution if you want to offer your game for free.
