We're also using a very open development model - most of the code that runs our apps is MIT licensed and easy to use elsewhere: https://github.com/rundexter

Having some loose set of code repos up that claim to "run your apps" is no excuse for not having a sustainable and publicly scrutinized revenue model for the project. Without a model in place, savvy users (like those here on HN) will realize that your model may change later (because the VCs require you to exit for example) and that will affect how we get along holistically with your product later.

Totally appreciate that concern!

Other community-oriented services out there are built on top of a completely free platform, which makes it very difficult to pay the bills and why you see so many of them shutdown.

While we're in beta, our services are totally free, but we will have to find the right pricing model down the line.

I suggest to start now. Benefits: you will know sooner if this business is sustainable, and you won't piss off customers "down the line".

Strongly agree. We'll be rolling out of beta pretty soon with a pricing structure.