I just don't understand why developers underprice their apps so much. You're talking about an app that people are constantly raving about, and that people use for multiple hours per day. Charge $5/month, that's half the price of Netflix or Disney+.
Complaining you don't get free stuff anymore is really unbecoming of an entrepreneur.
He wasn't complaining about that. He was led to believe that the price would be reasonable, and he was willing to pay a reasonable price, as he already pays Imgur.
It seems the OP has a very distorted impression of what "reasonable" means to another for-profit company.