Starlink is primarily trying to act like a "bent pipe", with the downlink being physically close to the end user terminal in order to reduce both latency and bandwidth requirements. This means having to place your downlink terminals in areas with lots of humans - which of course means the aether is going to be a bit crowded.

On the other hand, an earth observation satellite doesn't need a sub-second-latency link. If you're relaying data via an earth-covering network, nothing is stopping you from placing a bunch of downlink terminals in remote areas of Australia. No need to fight over frequencies when there's at most a single-digit number of humans in a 100km radius!