The only reason Safari has any market share is because it's the default on every iPhone.

4/5 top browsers by market share are there because they are preinstalled on millions of devices and none of them are terrible enough for an average person to look for an alternative.

Exactly right and I wish more people understood this as the key dynamic driving change in browser adoption. Just for one more example, what little toehold Edge and Bing have right now are from muscling those in front of people as defaults.

Which I think is important as it relates to Mozilla. Because a lot of the arguments back and forth about Mozilla assume that change in browser adoption was about what features they did or didn't add. But I think that completely ignores powerful actors leveraging monopoly positions to drive users to their browsers, which is more important by several orders or magnitude. Any explanation of that history which leaves that part out is revisionist history in my opinion.

Indeed, otherwise the only thing left would be ChromeOS Platform and its forks.