good Performance gut no transparency with payment

Very good what they Arme doing, gut no transperancy with the money. First you get it free than with an update it went to be paid, but this information is hidden and suddenly you have to make an account. By making the account you have to commit that you pay....
why????? is it so ??? It destroys the good appearance of the app. I deleted all ... and I am sorry about .

Afrata about Knee Decide, v5.0.0