I'm starting to notice that more and more subscription services are opting to use a 28-day monthly renewal period. At first, I thought it was just a lazy way to make sure the business gets the best end of the deal each month, but the result means they can charge an extra monthly fee per year.
I'm keeping this in mind. Next time I create a subscription service, it seems like a great way to make a "cheaper" looking subscription cost while effectively charging 13/12 times per year.