What's wrong with companies teaming up for specific individual products? In this case, Flight Simulator. You license the technology with friendly fees and collab for the life of a single product. Just like all licenses.
(Also, no, MS/Asobo are not doing fine, their photogrammetry is renowned for looking like a molten hellscape, and the bing maps look pretty terrible compared to even plain gmaps, but it's MS so "it has to use Bing" =D)
I thought it was Blackshark.AI doing that specific part of Flight Simulator. AFAIK they are, or at least were looking for to, also selling that capability to other companies; and they are certainly not “vendor locked” with MS’s data..
What about it? Google charges MS/ASobo a "friendly" license fee, and MS/Asobo get a feature they can use to attract more players. All parties stand to gain concrete dollar amounts, the very backbone of capitalism.