Facebook announces Libra (later renamed Diem), a global digital currency backed by a basket of fiat currencies. The announcement sent shockwaves through governments worldwide and inadvertently validated Bitcoin's thesis.
Regulators who had largely ignored Bitcoin suddenly panicked at the idea of a Big Tech company launching its own money. The backlash effectively killed Libra, but it accelerated central bank digital currency research and drove more attention to Bitcoin as the only truly decentralized alternative.
Wikipedia: Diem (Libra)