You can look at the https://satellitemap.space/ to see that starlink isn't (yet) too feasible in the northern/arctic areas. Even in the Nordic countries the connections are not that great.
>> We're talking backup vs. primary. Of course the backup is not going to be as good.
Then it isn't really a backup. A lower-bandwidth failover capacity is properly described as an alternative or degraded pathway. To be a proper "backup" a thing has to actually do the primary job at least temporarily.
aye. Starlink could be, best case, an Out of Band (OOB) management interface.
good for getting into the other side of a connection or doing some management tasks like back-up telemetry -- but we're talking SNMP, SSH connections to routers, etc, not GigE levels of data.
It's a good idea for future satellites, but upgrading existing satellites is probably not feasible.
And these polar orbit satellite typically live a lot longer than the relatively short lived starlink satellites, potentially opening you to a (perhaps unlikely?) scenario where starlink moves to new and incompatible hardware for inter-satellite communications, and your satellite is then made obsolete.
Vertical integration is not cheap, but it does have it's upsides.
That would require replacing all the satellites with new ones capable of doing that, which doesn't seem feasible. Starlink also doesn't have great coverage of the polar regions.
“We're passing over terabits per second [of data] every day across 9,000 lasers,” SpaceX engineer Travis Brashears said today at SPIE Photonics West, an event in San Francisco focused on the latest advancements in optics and light. "We actually serve over lasers all of our users on Starlink at a given time in like a two-hour window.”
Again though, you can't do "Starlink from the satellites, so we don't rely on a specific ground station" unless all of the satellites support talking to Starlink, which they don't. That means they'd have to be replaced.