The author has every right to stop accepting the uncalled for abuse from users and drop development and support. I hope he can direct his attention to things that give him joy instead.
I have donated to this app and I am genuinely happy with Marcel's efforts to add features. Users aren't always the problem.
On the other hand you don't need to put your app there, except for maybe if you want to attract some users./s
This is certainly not "shipping people's contact lists off to a third party". Is there somewhere else this is happening or are you mistaken?