[tinco]

Well ok, maybe I should have said "theoretically risk free", I meant more in the economic sense. You are right of course, I guess in practice there's no 100% safe way to store billions worth of assets anywhere.

Though.. I can imagine there's a lot safer options than some small polish bank.

Maybe they could become a bank themselves to contain some of the external risks.

[jerguismi]

To become a bank you need an account at the central bank. Getting a banking license is difficult. And even after you get it, central bank can freeze your assets any time.