LEO satellites decay very quickly every one of them will burn up in the atmosphere within 10 years. They need to be replaced constantly. As soon as spacex goes out of business these will all fall out of the sky.

Don’t count on it. These things don’t just zip along in their orbits. LEO is crowded. They have to maneuver to avoid collisions… a lot.

Over the past six months, Starlink satellites have been increasingly performing collision avoidance maneuvers. According to a report filed by SpaceX with the US Federal Communications Commission (FCC), SpaceX broadband satellites were forced to avoid more than 25 thousand times from December 1, 2022 to May 31, 2023. And since their launch in 2019, the total number of maneuvers has reached 50 thousand.

If Starlink or any other mega-constellation company loses control of their satellites for any reason, there could be collisions. A recent study (Note: PDF) suggests that a sufficiently powerful CME could cause a runaway Kessler Syndrome in as little as 2.8 days.

And the orbits of that debris would still decay within a decade in LEO.