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.
I am not sure how to write this without it sounding like an ad for Starlink. It definitely isn't. Just trying to add an anecdote to the conversation. I live in Canada and there are a small number of people that I know that have given up faster, cheaper internet from Telus/cable/etc for Starlink. I think what it comes down to is people are tried of the two year contracts and having to negotiate a better rate and never being able to get the same deal as a new customer. Loyalty is punished.