Can't install any app, App Store asks for credit card
You need to select that you don't have/want a payment option.

Navigate to this magic link on iOS or macOS:
https://apps.apple.com/account/billing
Remove all payment types from the list and choose None as the payment type.


If you're not able to select None or the None option is not present for you to select, there are some possible reasons as to why this is the case:

Unpaid balance
Changed country/region
Family Sharing management

For more information, see the Apple KB article:

Why can’t I select None when I edit my Apple ID payment information?

If you want to create a new Apple ID with None as the payment method, purchase a free app from the App Store and choose Create Apple ID. For more information, see:

Create an iTunes Store, App Store, or iBooks Store account without a credit card or other payment method