Well thanks! But actually, building the network is indeed a big challenge. We've spent the better part of our 3 years just thinking and implementing methods to do it. We've arrived at an SDK model [1] where we work with app partners to integrate simple sensor code and contribute to our network. So we're able to grow quite quickly compared to a single app to download, but it's still not easy getting the necessary scale. We're aiming for about 10 million sensors, currently have 0.5 million. So we're getting there.
I've sent @elonmusk a few messages over the years but no replies so far. I am @vallesmarineris, so I think one day he'll notice that I already live on Mars and we'll chat.
[1]: https://github.com/Cbsoftware/pressureNET-SDK