They could do something like Sentinel's 10m/px, but looking at those images [1] I don't see the advantage of updating that more often than the once every few days we already have from Sentinel.

To make near-realtime interesting you need something closer to 1m/px where you can clearly make out cars. But at that point the optics and camera take more mass than a normal star link satellite. They would become earth observation satellites with an internet uplink, not the other way around.

1: https://apps.sentinel-hub.com/sentinel-playground/