IMHO (In My Humble Opinion): It shouldn't be "Getting of US-Tech", it should be "Getting of proprietary tech".
Open Source and Free software, open standards, supported by local experts that are part of the global community — that's the way to #DigitalSovereignty. Many have already chosen that path, so the current push is more of an accelerator, a catalyst, not a radical change. The difference between Revolution and Evolution is just one single letter :)
Unfortunately #OpenSource is #US controlled anyway.
We can hope to sneak some patch in, as with #xzutils, but there's no way to make #Chromium or #Android development "sovereign".
Try hard fork them.
Same for "open standards": what if a standard ( #QUIC?) only serves the need of US #BigTech #hyperscalers and surveillance (0-RTT?)
Then sure, while getting rid of US Tech it would be wise to get rid of proprietary software too.
But #DigitalSovereignty is about breaking free of an evil empire.