This is one of those situations where "monopoly" is a very overloaded word in terms of what it means to different people in different situations, causing confusion when it gets broken down into specifics.

Most people were never worried, and probably will never be worried, with the points you're listing there. That's not to say they've stopped hating browser monopolies, just maybe not your definition of what a browser monopoly is or why they're problematic.

In general (not just browsers) most people treat "popularity" and "monopoly" as completely orthogonal concepts. I.e. something unpopular can still be a monopoly, something with 99% usage can still not be a monopoly. There is typically just a tendency for extremely popular things to also happen to be a monopoly.

Because it doesn't matter that much, as Chromium is open source, not to mention it did a fine job thus far in advancing the open web.

I'd like Firefox to stick around, but as far as I'm concerned, if Safari goes away, I couldn't care less.