Upvoted because I need this! I agree! I just got it from itch.io's latest bundle for racial justice, but I'm absolutely in love with the game and would love to have a Steam Key provided to me just so I can play it again and get all the achievements.
I do see that bundle specifically says no Steam keys will be provided, which makes sense given the massive size of the bundle compared to the minimum price. The other bundle did at least have Steam keys for a few games.
Yup, which is unfortunate, but for a good cause and great games who cares...I bought it anyways. I would be willing to pay a few extra bucks for a steam key for the games that have the option tbh, wish it was possible.