I have made purchases from your company, the app, the radio... and I remember you guys asking me for 'support', maybe mentioning some analogy of buying 'a cup of coffee' in the dialog.
I liked the features such as the EQ and Audio Units, and thought it was reasonable enough to make further purchases enriching my experience with the app.
So I did get you guys 'a cup of coffee'.
I thought I could make more use of those features with additional payment... until now.
Supporting you guys got me nowhere, and those features were taken away from me.
I do understand the temptation to implement subscription services.
In fact, it perfectly makes sense for 'services' to have them.
However, for the features that were already there, especially with paid customers, even if the payment is not directly related to those features,
this is not the right way to do it.