At the risk of being the well-aktually guy, Starlink satellites (along with all other similar recent-design LEO commsats launched from the US) are required by the FCC to be designed in such a way that they burn up completely on re-entry. This claim by the FAA is based on a decades-old study involving the Iridium satellite family, which use an older-type satellite bus design that was not designed to cleanly burn up on re-entry. The Iridium satellites are also much bigger and heavier than Starlink satellites.