They're not mutually exclusive as far as cost goes - quite the opposite (hence all the talk about "synergy" and "vertical integration" in enterprise spaces) - but you're right about consumer prices. I think what's keeping the consumer prices for Starlink down is that for the vast majority of its coverage it does have competition.
Much like how it's in Tesla's best interests for the US not to invest in high-speed rail (hence Musk's "Hyperloop" stunt to prevent an infrastructure investment), it's in Starlink's best interests for countries not to invest in broadband technologies (whether it's mobile networks or fiber). I'm not aware of any plans to dissuade governments from those investments yet but I wouldn't be surprised to see it. Presumably Musk is too busy with Twitter at the moment.
Much like how it's in Tesla's best interests for the US not to invest in high-speed rail (hence Musk's "Hyperloop" stunt to prevent an infrastructure investment), it's in Starlink's best interests for countries not to invest in broadband technologies (whether it's mobile networks or fiber). I'm not aware of any plans to dissuade governments from those investments yet but I wouldn't be surprised to see it. Presumably Musk is too busy with Twitter at the moment.