How do they know Starlink isn't going to jack the prices up?

They eventually will but there is also coming competition from satellite providers as well to suppress prices long term. Those ground based providers will still have a lot of infrastructure in the ground and they won’t go down without a fight.

They aren't thinking that far ahead. It is just the immediate rate they are on. If it doesn't work out, they can always go back to Telus, etc at a way better rate than they had as an existing customer.