This _was_ done a couple of decades ago, it was available on the downloadable version of google earth (when it existed). I remember playing around with it in 2012.

Google Earth pro is still available for download with the flight simulator, which is much better than the new web version. I played around with it last night after being disappointed with the web version.

Can confirm, we used to play it in the high school I went to around 2012 because it was one of the few games that the network filters didn't block.