though we have agreements, you still have to apply for and receive the spectrum from each country.
For WISP use though, I am not too worried. Per the FCC approval for the Starlink space stations, “SpaceX proposes to operate in the 10.7-12.7 GHz, 13.85-14.5 GHz, 17.8-18.6 GHz, 18.8-19.3 GHz, 27.5-29.1 GHz, and 29.5-30 GHz bands.” And per ISED Starlink STEAM-1 NGSO 10.7 – 12.7 14.0 – 14.5, so as you can see it is out of WISP common frequency usage (because we are cheap AF when it comes to getting spectrum). What this will have an effect on is your paid ptp spectrum, but since you are paying for it it should be clear of interference or you annoy the regulatory body until they give you a channel not used by anyone else. Also keep in mind the Wild Blue/ Xplornet have been providing similar service, albeit with higher average latency, and are more likely to be affected by Starlink frequency/competitive market than we are.
As for the financial side, Starlink is not economically sustainable until it is about 50% usage and then its time to replace the satellites which up the cost. My point of case can be seen with the Iridium and Globalstar networks which are basically dead/dieing.
The US government funded from the broadband initiative program, same as Google and Amazon Fiber, same as which every WISP/SSISP has access to. So not subsidized, but they do get a bigger piece of the pie due to the number of square miles covered and the proposed bandwidth available. Unlike here in Canada where the programs are geared towards the Tier 1 and 2 categories and leave us tier 3 and 4 out in the financial cold.
If you are worried about the proposed 8ms latency spec, dont be. its 3.001ms one way to a satellite and the signal may have to bounce through as many as 15 satellites before returning to earth. So at a lowest calculated possible of one satellite to ground station link (no going to happen often!) with the proposed bandwidth loading, best you could ever achieve is 9ms (8.49ms by my calcs) as there is an inherent delay for the signal to be processed and relayed which gets worse as more connections are relayed. Now add the average internet delay and realistically its no better than having a docsis connection. Even if they add more down stations right on top of every major datacenter, it will not get much better and this is the edge we have. We can get better by limiting the SM to AP ratio. Offer value added services (which most of us do already) and keep our pricing down enough to not loose our shirts but also not high enough to cause clients to look to other options. Statistically clients keep the same provider unless the provider does something to annoy the client to the point of frustration. In WISP terms, lots of disconnects or consistently poor performance for the dollar paid. Bad customer service isnt a factor as many providers that still exist can attest to, but it doesnt hurt to have very good customer service.