We used to be in this space, and with Ayvri/Doarama - which was a 3D virtual world but not a flight simulator, it was used by paragliders to replay flights, commercial drone operators, some defense, transportation planning (trains, maybe others as well), etc etc.

We approached Microsoft when we were selling the company, and the response we got was "you're too close to work we're doing for us to even look at you or talk to you". I assumed that meant they are building out a digital twin, with capabilities to run in a browser at high speed with high resolution (which we did). That was 3 years ago. I'm surprised we haven't seen something from them yet.