I'm not here to argue the app store pricing, it's been discussed to death. that being said, I disagree with you that they do nothing.
>No, and no credit/debit cards, PayPal, etc. either. Only Apple's in-app purchases are allowed on Apple platforms. You're not allowed to hint that other payment options are available, either.
How do you think people pay for things on the app store if not with a credit or debit card? You can also use paypal (https://support.apple.com/en-us/HT202631). Seems like you are just going off your own misunderstanding of Spotify's phrasing. As to the other options, that seems consistent with not being able to market off-app purchase options. What would those other payment options be, btw? I just checked and on their website they only take credit cards and paypal...