What protections are in place to prevent a bad actor from stealing a governments or corporation crypto?

For example microstrategy or El Salvador. Someone has the keys to the wallets that store all their crypto right? What protections are there to prevent theft? Can Michael saylor just disappear with the keys and all the bitcoin microstrategy holds? Can someone who has access to El Salvador’s wallets get elected, get the keys, then disappear? There’s a lot of conspiracies about the gold in Fort Knox being missing and I’m sure that’s a lot more difficult to steal than crypto. How easy would it be for someone to gain access and take the crypto and run?