I don't claim to represent the average app developer but I've never so much as heard of CloudRail, them claiming to be a "Unified API integration leader" and all. I can't find them being written about by someone like Gartner; some other sources claim that they're a European startup in the IoT integration space.
I guess I'm not sure what to make of some unknown-to-me company's study on usage of its own SDK for cloud storage; and this study being posted in 'news release'-style on their blog. To me, these are huge grains of salt.