Today I learned that marginal profit is not what i thought it was! Thanks for your explanation

Which investor is willing to sink $1B for 0 marginal profits? No one is going to do all that work launching satellites to make your internet cheaper.

Service providers compete by differentiating their offerings, not their prices. Consumers are often willing to pay a lot more for a service provider that meets their demands. Bezos earned his AWS money doing exactly that - there are plenty competitors that may be 10x cheaper.