Why do I have to pay subscription fee?

You only have to pay, what you purchased! When you made your purchase, the offer you had at the  pricing table, that is the only thing you have to pay, so if you have to pay a subscription fee, that happens, because you purchased a package with a subscription fee! We change our pricing table from time to time, but that doesn't change the deal you had on your package. So even if in our current pricing table you wouldn't see a subscription fee, that doesn't mean, that you purchased that package! If you want to see our pricing table, when you made the purchase, you could do that for example here.