None of that's relevant, though.
Those of us who claimed the game for free on Itch should be able to download - from Itch - whatever builds were published before the move to Steam, full stop.
It doesn't matter that we didn't pay anything - we took advantage of an offer to have access to the game as it existed at the time (early access, pre-release, whatever). Taking away access now comes over as mean-spirited at best. I wouldn't have expected a Steam key, but I do expect to be able to download what I've claimed.
I don't really get your "I won't sell on Itch" standpoint either, tbh. Plenty of devs sell on both platforms, accepting that Itch adds sales tax. I live somewhere with 20% sales tax and I've bought several games/dev-specific bundles from Itch which included Steam keys, albeit on sale (Agelvik's Black Friday '23 sale being the most recent). I don't care about leaderboards either, so offering a version without this feature wouldn't bother me.
Please reconsider your decision!