I have a subscription only because it was added on to another service. I wouldn't be surprise if they padded their numbers by giving out accounts as paired deals.
I agree that a person has a right to charge for their work. I just feel mods are a real legal quagmire. The best way around all of this is a Pateron style system where a creator is supported but not directly charging for mods.
The issue is that mods often use some part of the original creation so ownership is a tricky issue. However if the company is willing to pay creators then I guess that is OK, like this case.
Cheers to him.