Gee, another thread in which the S4GRU staff denigrates their sponsors based on the device they use
There is nothing technically preventing Sensorly from releasing an app. There is a thriving jailbreak community (saurik, founder of Cydia, estimates roughly 10% of iPhones - thats many millions) which provides APIs and unfettered device level access to developers who wish to circumvent the App Store restrictions. It is such a large market in fact there are developers whose sole income is sales of jailbreak apps.
Not everyone who chooses an iPhone is a moron, rube, technophobe, or whatever. I would simply like a smartphone that doesn't require me to be logged in to Google to enable its full functionality. I'm not paying $200+ for a device so that Page, Brin, Schmidt & Co can creep on my every GPS location, text message, phone call, and URL I visit. Through a combination of iOS opt-outs and jailbreak tweaks I can be completely assured of my privacy on an iPhone. The same cannot be said for Android.