Comment by toast0

If I have a sales contract with you where I will gladly pay you Tuesday for a hamburger today, and on Monday hamburgers are outlawed, I still owe you on Tuesday. If purchases or hamburgers on credit is outlawed on Monday, I most likely still owe you on Tuesday.

Otoh, if I pay you today for a hamburger on Tuesday, and on Monday hamburgers are outlawed, you can't perform your part of the contract, and we'll need to figure things out.

The rules can change, and when the rules change, continuing service may need to change (depending on how the rules were written); I'm sure part of the contracts involved also describe a) how to make changes in the services, b) what happens when parts of the contract are discovered to be unenforcable or illegal.