I can't imagine the Cloud Act being effective without Microsoft (and French gov) complicity.

If they can make successful tax shelters they can architect the entities and the architecture to remove this option.

There's some 9-eyes thing where this is a feature not a bug

Microsoft tried architecting a "surveillance shelter" in Ireland. It worked. That's actually why the CLOUD Act even exists[0]: it was passed specifically to prohibit Microsoft from doing this.

[0] https://en.wikipedia.org/wiki/Microsoft_Corp._v._United_Stat...