The pay wall is definitely a reason to not support. But from what I can tell, the dev is releasing a separate version now, that "IS" the "Extra Version", and the version here is the 'free version' with no upgrade capability. If you force tell renpy that it is the 'extra' version, it will start spitting out error lines the moment you get to any "Extra/VIP" spots, cause the content doesn't exist in this version of the game. You have to have/downloaded the Extra Version that has the scenes. Pretty lame.
Getting extra camera angles behind a paywall, and the dev is doing everything in their power to get you paying $25 a month. It's worse then Ubisoft, EA... you name it. Atleast they ask $9.99-$19.99 for a bunch of games, not just one singular game with extra screen shots... I feel like the dev has drastically overestimated their valuation. There is 'support' and there is borderline robbery for a few extra screenshots. That or you're paying $10 every update on Itch.
In saying that, This is the sorta crap that has been losing AAA companies money in the past few years, with followers in the millions. Don't really get why it's being attempted with a dev that has a following of roughly 340. I guess it has to be working in some minor way or the dev wouldn't be so dead set on spending the extra time limiting us.
If anyone's got the Extra Version, feel free to be our hero. If not, I'ma wait until this is completed and released.
Also, from the bit I did play, there is TONS of copyrighted music in this game that makes up 90% if not more of it's atmosphere, so I don't have a clue of how it will survive being put on Steam.