> Why would ANY global business still rely on U.S. Tech?
First and foremost, because it takes time to switch.
Secondly, because there are a lot of things that just don't have realistic alternatives.
For a large agency, especially one that has statutory or regulatory requirements on how they decide on and deploy hardware and software, even if they can legally choose to switch to open-source options, if they made that decision the day after the election last year, it might have been too late to get major proposals in for the 2025 fiscal year, so they'd have to wait until 2026 to do more than start planning. (This is, fairly obviously, a near-worst-case scenario; other agencies will have much more freedom to change as they please.)
Even if they're less encumbered, the more users you have within an organization, the longer it takes to execute a migration like this, and it can be really really hard to operate for any length of time with a partial migration completed, especially for the support team. I could easily believe that some such migrations are already in the planning stage, but will take months to actually happen.
And finally, because This Is How We've Always Done It is a very, very powerful force. For some organizations, unfortunately, it will take some kind of catastrophic event to realize that they really shouldn't be relying on a foreign and possibly hostile power for all their major enterprise IT vendors.