Its indeed not something we have much control over, its because paypal enforce having a credit card attached to the account to use subscriptions.
As many other said, get a prepaid credit card (5-10$), and link it to your paypal account (read the details on the specific prepaid card you get to see if you need to register it and what not). Once it is on paypal, youll be able to use every features without actually owning a real credit card
( as long as you never run out of money in the paypal/bank account, if you ever get a refused transaction and your credit card cant cover it, your paypal account will be flagged and then it become a little more complicated.