Has anyone ever used services like AppBackr or Kickstartr to fund app development?

I can’t. It’s not posibble in my country because of stupid law.

I haven’t but I know at least 7 devs who have taken this route and didn’t get very far. You would think that the tech sphere would be more welcoming to venture capital for technology, but it really isn’t yet - especially for mobile app development. Don’t mean to discourage, just sharing what I know.