[tobias3]

I very much doubt that the US would allow EU institution to break up the US tech companies as they see fit. So this is not a viable approach (even if it would work).

The approach would be to gradually limit EU market access till there are other alternatives. This has worked for e.g. China.

The German defense force uses Google cloud instances for their "sovereign cloud". I very much doubt that if there were a German Hyper-scaler that it would have similar market access to contracts such as JEDI. Having a buy European requirement there is pretty much a no-brainer IMO.