There must be more specifics about that too. I know games I backed on patreon needed to make the price for a key higher since steam wouldn't allow it to be gifted at a lower cost. But Humble Bundle does that, so I'm not sure where the line is.

Nope. There's like 4 different lawsuits going on, about trying to sell on stores that do not offer steam keys. Steam unofficially requires the lowest (nonsale) price, regardless. It they threaten to drop you from steam completely.