[account42]

That's how publishers want thingns to work. But if the store interface gives one impression and the smallprint annother thne it's not clear that the contract is what courts will uphold.

It is worth noticing though that Steam has stopped using the word "Buy" and instead use terms "Add to Cart" and "Continue to payment" which are perhaps more ambiguous but still not much so IMO. They did however use "Buy" in the past and changing the store interface now should not excempt them from fulfilling the expectations they have set in the past.