Because Microsoft is in the game of being a big business, and demonstrably is not in the group that needs a fair market to thrive. MS is/was willing to make the same deals as Google for defaults, it's just Google valued it more. They should be in hot seat #2.

Smaller companies like DDG, Brave, Kagi are the ones trying to build narrow, competitive businesses in the search and browser space. If those are struggling due to anti-competitive practices I want to hear it.

Because Microsoft is doing worse things than what they are accusing Google of, such as forcing users to use Edge and Bing in Windows. Also, considering the fact that Bing's market share did not increase even when Microsoft signed a contract with Apple to make Bing the default search engine on iPhones, and the testimony that Apple did not acquire Bing because of its poor quality, Microsoft's argument is completely unacceptable.