There is a group running a project sharing sensor data.
https://iotic-labs.com/experience/uses/
It sounds like this proposal is similar to their aspiration of making sensor data available to all. It strikes me as great idea and probably goes hand in glove with what TTN is trying to achieve. If the data is made available to all then it can be used for all sorts of analytics and perhaps a big commercial capability at the end of it.
I'm all for it, you don't have to share what your actually doing with the data.
I'll go take a look at OpenSensors.io now.