Microsoft never stopped self-believing throughout the Ballmer era. Certainly not as a result of any EU ruling.

Break-up is a misguided approach. In the case of SO, it only served to make the consequently-more-highly-valued parts more acceptable to, and the whole more deeply integrated into society.

I think technology will again be the solution to today's evil-of-the-month. Which is not to belittle these real and important issues.