Alexander from Realm here. I agree that deployments are not the only (or even nessesarily most interesting) metric of usage. But it is a good example of how remarkable mobile growth is. At this point there are just crazily many more mobile devices out there than there ever was on the backend and server side.

It is an interesting metric for us, given that sqlite has for a long time (rightfully) claimed to be the most widely deployed datebase in world, which is also primarily based on their usage on mobile devices.