I expect that many of the players have their private keys not only on accessible machines but also likely under version control. Probably on a cloud platform.
Microsoft? YOLO with their crown jewels:
https://techcrunch.com/2023/07/17/microsoft-lost-keys-govern...
All senior dev's, physical locations, board members, hell, even all stock holders, could cryptographically vote via an agreed upon method for any actions.