[b__d]

I have the very strong feeling that this is is powered by https://register.apple.com/placesonmaps/ – at least as a hint. As soon as you have officially registered your Apple Maps entry (with an website URL) that website gets on the list.

e: This is reinforced since we updated our domain/URLs from a ccTLD to a gTLD not long ago, also claiming the Maps entry, and the list reflects the gTLD domain!