This is really the truth of the matter, isn't it. All major payment processors permit merchants to refund. Each merchant in this case can revoke licence keys, i

This is really the truth of the matter, isn't it. All major payment processors permit merchants to refund. Each merchant in this case can revoke licence keys, if only they were to connect refunds to revocations in their store. This isn't a "can't do", it's a "we don't want to do" situation.