It would be cool, but a project on itself. Definitely doable though.
Seems your service can be used anonymously... a bit expensive though. But, criminals may be your customer to make extortion calls.
As I can see, you are talking about making it open source. Hows that going to financially benefit you ? Will it be partially open source, so that use of your service remains mandatory ? Or you plan to monetize it from BitKit API ?
As many have pointed out prices are quite on par with better services, but that's besides the point. We have no intention of monetizing this, was a fun project/proof-of-concept.
We already monetize BitKit (Coinkite's API), there is over 1,500 devs and over 1K startups using it.
https://coinkite.com/startupsIn regards to abuse, we have very clear terms of use, so does the telco provider. The call receiver can also block his number, no questions asked.