Re: "I think this is a realistic fear nowadays"
"You keep company money in someone else's bank"
There have been strict rules for a very long time about bankers not helping themselves to your cash and on the whole banks have a long record in looking after money. In the case of individual investors there's further backing in the form of compensation rules. Even so, if any European country were keeping its money solely in a US-controlled bank I'd expect them to be looking at moving it out.
The equivalent doesn't apply to keeping information in somebody else's computer. Rules are recent and not yet sufficiently well enforced where they exist (GDPR). On the contrary there are rules enabling governments to force the owner of the computer to break any agreements as to confidentiality.
Information and money work differently. Either the money is in your bank or it it not. Although information is spoken of as stolen it usually isn't - it's copied or illegally accessed but still there with no absence visible to the legitimate owner so that "theft" is not readily noticeable.
Going back to banking, there is one aspect which should be looked at for risks arising from actions of the USG: card transactions. To what extent could these be frozen at whim, disrupting the RotW's day-to-day retail transactions?