The CallKit framework is definitely a welcome addition, and Nomorobo is quite good. I am actually working myself on a new app similar to Nomorobo, but with some additional features that so far no other app using CallKit provides. I decided to write such app because of the daily robo/telemarketers calls I am getting.

I will pay well for this provided you do not harvest call activity and your TOS has teeth against that.

All others I’ve found so far harvest and resell your call network.

I look forward to a Show HN post!