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What I really do not understand is the runaway price of keys on any of the platforms. It makes no sense and limits the audience of the creator. Im not sure if this is supposed to be a feature to encourage buying and selling of keys to have people pop inand out of multiple communities instead of one growing to large.

We can expect that the user will be able to set the height of the paywall in the future.

The reason it's built this way is because it creates insane hype and generates immense fees for the centralized dev team. Once the hype dies down they'll be forced to create more sustainable models or more likely just die.