Pixels literally have unremovable Google ad right on the home screen. The search bar. Just because it has additional functionality, doesn't mean it's not an ad.
You can trivially install another launcher without that search bar and disable nearly all bundled apps on Pixels. Show me how easy it is to remove all the ads and bloatware from Windows.
And regarding Windows, first I want to tell that I'm not a fan of recent MS trends too. Second - I personally never had a single ad on my Win10 and current Win11, so I wouldn't know how to remove those :) . And third - to remove bloatware just uninstall it from the Programs and Features, like OneDrive or Office. LLM can be disabled in Settings. Some bloatware will remain due to deep integration, but that's the same issue as with Google or Apple. For instance I may not want to see Stocks app on iOS, but that's not my choice to make apparently :) .