You don't have to provide details, ever. I have Spotify Premium. I go to a retailer and use cash to buy a card good for a year's subscription for $100. Then I enter the card into my account. The email address is @mailinator.com in case I ever need to check something, but otherwise they have no clue who I am.

When it expires, if I haven't been paying attention, I live with free-tier for a day or two until I can go buy another card.