Premium
1. What is Castbox Premium/membership? How can I subscribe to it?
2. How can I know the next billing date for my premium service?
3. How can I cancel my Castbox membership/premium subscription?
4. Why am I still limited to 100 subscriptions after going to the Premium?
5. Why am I still hearing audio ads after I go premium?
6. If I use more than one device, do I need to subscribe to Castbox Premium multiple times?