It's really pretty telling that they leave out the most obvious, and, I'm guessing, common answer: "I'm content with my current browser want to stay with the thing I'm used to."
What's so pitiful is they aren't asking because they want a vibrant, diverse browsing ecosystem. They're asking because they're on the outside looking in to a platform-defining position of market dominance.
This roughly translates to "we know damn well why you're downloading Chrome, and we'd really rather Google or Apple be left wondering why you're downloading Edge, but we have no idea how to get there"