Even if the purpose was to advertise Stripe, the ad has very evident intention to provide value to the viewer of the ad, which is to provide information, so the purpose is not singular; and yet both its intended purposes are not being done very well.

I think that what really happened here is that you are upset because you found yourself arguing for a position that you can’t rationally and convincingly defend, which is a position that no one forced you to maintain in the first place. You should know that there’s also no joy in dealing with someone like that.