It’s been over a year with these macOS pop-ups and I still have any idea why an app is asking, what should I say, what is the penalty for choosing Don’t Allow, etc. What a frustrating experience.

(Edit: I’m showing Chrome here but I am getting them for so many other apps without seemingly any rhyme or reason.)

@mwichary I think those are from Chrome checking whether there are devices it can ChromeCast to on the network. If Chrome weren't Google, I might trust it, but with Google I expect that it will phone home and use my ChromeCast data to show me ads.
@yildo @mwichary Chrome's entire purpose is to put your eyeballs in front of ads and hoover up your data, I have no idea why anyone uses it.