> What is the political element in Germany that makes these very public walk away from Microsoft viable?

Russia is waging war on Europe. America is increasingly aligned with Russia:

https://www.bbc.com/news/articles/cpvd01g2kwwo

When the US government has become erratic, unreliable, untrustworthy, and aligned with your enemies then it's necessarily time to de-risk your infrastructure and supply chains by removing America products and services from them.

It's the same reason you don't want Chinese equipment in your telecommunications infrastructure. You can't trust what the Chinese government will do to it or with it.