The hurdle for users of the free version of the app is the subscription fee paid for the premium version of the app.
A lot of people do not pay and cannot afford the premium fee. Some people are not very sure at the initial stage of using the app.
People sometimes want use app for free for some time.
A Subscription is simply known to be paid so as to access content from an app or service for a set out period of time. For example, subscription to Netflix on a monthly basis.
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