SpaceX

I can only speculate on reasons. Cameras would add mass and energy consumption, and they're already launching a lot fewer satellites per launch as it is. I suspect that good imaging requires a lot of specialist knowledge and experience, like how to build lenses and sensors, and what frequencies of light to look at (visible? infrared? radar?), and how to do destriping and other image cleanup. There are already other companies with satellites in low orbits with frequent imaging and sales channels to customers, so I don't think SpaceX would have that much of competitive edge (except having more satellites). Some Earth imaging is provided by governments for free, says Wikipedia's Satellite imagery, including Landsat, MODIS, and ASTER for the U.S. alone. There are lots of private providers with high resolution, like down to 41 cm, so they probably have big imaging systems on their satellites.