That's exactly how it works! For example, in the supermarket: they offer a promotion so they sell more of a product than usual.

with rule 15 I will deeply despise myself if I ever buy something in there again

"What you shouldn’t publish on Steam:

...

15. Content that may violate the rules and standards set forth by Steam’s payment processors and related card networks and banks, or internet network providers. In particular, certain kinds of adult only content."

https://partner.steamgames.com/doc/gettingstarted/onboarding

what are you saying?