no, they really don't. if the sun tracking app didn't exist, I or some other enterprising fellow could make it, and release it for free. It's at best a series of calculations, or just taking data directly from some api.
Just because a business model can be made around something, does not mean a business model needs to exist to sustain that thing
Just because a business model can be made around something, does not mean a business model needs to exist to sustain that thing