The difference seems pretty meaningful. Google analytics really has nothing to do with Chrome in this context, the same thing would be true in any browser visiting a site with Google analytics tracking.
Chrome is designed to give Google control of the information it collects. That is the only reason it exists. It has everything to do with GA. They're not burning millions on developers out of goodwill.
> Chrome is designed to give Google control of the information it collects
Sure, but chrome does not do this in incognito mode, same as any other private mode browser, there's nothing specific about chrome that allows GA to collect your analytics in incognito mode, GA can do so in any browser.