If the company dares to invest a large amount of money in bitcoin, then the level of security they use will certainly be much better. They don't want to risk losing assets and have certainly prepared carefully to use a much safer wallet.
Their coins - their right to keep their secrets shut
In all honesty, big companies know their business, surely.
We can only say about smaller companies that will flock to BTC in the near decade to have (just maybe) some issues or breaches in the future to come, and I am eager to see something like that to be set as an example for others.