They probably don't require payment, they just require you have a valid payment method entered into your payment information. If an item is free you won't be charged. You can also try to use your account without a payment method but you may still encounter the requirement.
Create or use your Apple ID without a payment method - https://support.apple.com/HT204034
If you can't remove your last payment method or use no payment method with your Apple ID - https://support.apple.com/HT203905
"Learn why you can't use your Apple ID without a payment method in the App Store, iTunes Store, and more."