Actually, the reason might be different. Personally, I bought the premium status and didn't play a single game, then just forgot about it, and only now renewed it. So, those who didn't need to play didn't renew it. This can be solved by purchasing an annual subscription so that a person pays for a year and doesn't have to worry about it. This is clearly seen in the example of gyms. Probably many of us bought an annual membership, went for the first few months (days), and that's it. :D
But when asked if you exercise, everyone proudly answers - I have an annual gym membership:D