One is a bunch? It also seems as though that particular game wasn't even on any other storefront, just their own website. Hardly seems comparable.
Itch is also a much different beast, it's less a storefront and more a platform for developers to promote and sell their games independently. The pages seem designed and run by the devs and not Itch. It would make sense to not have a cart with that kind of decentralized design. You're not buying from Itch, youre buying from developers themselves.
Im glad to see you only care about your own word battles instead of epics. Weird that they seem so parallel, though...