Because in the US broadband ISPs wont wire up rural areas. My local school district has 40% of homes that cable will not wire. 13% of them can not get cell service at home. They have taken so many millions of dollars in state and federal money to provide service, but utterly fail to do so. We had a real good opportunity to build a public ISP to service our school district. A local Indian reservation had built up the expertise as they had accomplished it on their lands and was offering it to us. We partnered with a quasi-public development authority to handle purchasing and installation of equipment. Site surveys. State/Federal licencing. Starting an ISP is hard. The week before we were to start installing equipment on end users homes the cable company, who previously said they no objection to this, dropped a lawsuit. This was after thousands of hours of work and many thousands of dollars spent. We knew we didn't have the money to fight it in courts so we folded. If they had said they would have objected from the start we would not have gone done the path we did.
This venture was to provide students internet access for a tiny rural school district. They have YET to increase their footprint in this rural area.
So I hope starlink takes every fucking customer they have.