You idea is interesting.

Nevertheless I'll never install your app and will advice everyone against doing it.

It all comes down to trust. I personally seldom trust apps that potentially could touch my Steem wallet. I know of people that wont install such apps even from the Google Play, and never from untrusted source as the one you are promoting.

My advice to you : Put the source code of your app on GitHub, then post about that, ask people for their opinions.

You'll make more money, and build your reputation that way.

The way you promote your posts may work in the short term, but could be a red flag for all the people that care about the health of the Steem network (like the ones part of Hive account@steemabuse and Hive account@steemcleaners)

I wish you luck and will follow your progress.