It literally injects a "are you really, definitely sure you want to switch away from Edge?" kind of entry in the top search results when you use the preinstalled Edge to look up another browser. That is absolutely a dark pattern in my book, of the manipulative and desperate kind. Not to mention the constant struggle to (re)set your favorite browser as default where Windows fights you at every corner in pretty much the most extreme way that Microsoft can hope to get away with unless they want to risk sanctions from the EU.