The developer originally said he could sustain a $3 a month subscription, but after checking the numbers for higher usage account he saw that it couldn’t really work.

From /u/DBrady

I’m still looking into it, gathering data etc. Unfortunately the average call rates when broken down to the top 2, 5, 10% etc of users is painting a much different picture. This is the cohort of users I would expect to possibly convert to a subscription model and the average rates for those users can be 3,4,5 even 600 hundred calls per day just by the shear amount they use the app. Some of the top users are well over 1000 per day and sometimes over 2000.

So I’m not sure yet. It would probably have to be a usage based subscription model if it was going to be anything and I’m not sure that’s worth doing. I am still looking into it but unfortunately I don’t think my earlier price points will work.