Until rockets get a lot cheaper, (come on Starship, deliver on your promise) to get a result that is commercially viable from such a timeshare option, you need to tailor your payload to deliver an outcome that can be actually desired. Everything is a trade off, and until the satellites get 5-10x cheaper to launch again, you're under very tight constraints and you truly have to trade off every other aspect (wavelength, sensor type, resolution, power level, communication budget, mass budget, geographic spread/location, orbital height) to get one good specific outcome in a 10x10x10cm form factor. Yes, you can fit mobile phone electronics in these things. But they are usually 200km+ away from what they need to measure. Until consumer off the shelf electronics can give you the sensor readings you need from an entire country distance away, the requirements is still going to need an act of true cutting edge engineering if your goal is to operate for-profit.
This is not impossible mind you, the industry will continue to mature. But it's a world of the future, not a world of the present.
Then there's also some other companies who make the satellite bus and other parts for CubeSats like GOMspace [3] and NanoAvionics [4] (it looks like they have started doing launch and mission ops as well).
[1] https://www.orbitalsystems.de/
https://www.groundstation.space/esa-funds-12-new-experiment-...