It's interesting that most people on Windows PCs switch to Chrome when Edge is the default. It was obvious why people switched from IE6 to Firefox and later from IE7 to Chrome; IE was terrible; Firefox was better; Chrome was better still. Edge is not obsolete, unstable, or a security nightmare the way IE was.
Chrome even has significant user share on Mac OS; the numbers I'm finding are around 40%.
It's hard to guess whether people are much less inclined to switch browsers on mobile than on desktop, or if they just like Chrome. Either way, the odds are against anyone who tries to compete with it.
> It's interesting that most people on Windows PCs switch to Chrome when Edge is the default
This is primarily because most people on Windows use Gmail and other Google services, and any time you visit a Google web property from a non-Chrome browser, there’s a prominent “Install Chrome” button that’s placed on those. Without Google’s web properties pushing Chrome even to this day, Chrome may not continue to be as big.