They're largely not unless you are looking to appease your superiors.

OVH, Telecity, Hezner, Bahnhof, Tele2 etc;etc;etc;etc;etc; are all valid suppliers without the need to buy from hyperscalers.

I think what tends to work though is the idea that someone in redmond can't arbitrarily decide to shut you down as an individual or exert pressure. So it goes in order of importance:

A) Can we buy the software and use it in perpetuity

B) If we can't buy the software in perpetuity, do we at least control who has access to the software and our data

C) If we can't control who has access to the data then can we at least ensure we always have access to it?

D) If we can't ensure we have access to our own data then what are we even doing here?

Depending on where you fall on this line (which is a decision each government must make) you'll have to claw back something because right now we're all on D.