I've flown FPV drones through forests, it's insane. The reaction speeds needed are crazy. It is almost impossible to last a day without crashing. I'm sure there are lots of fun things to do with it, but Endor style races is not one of them. The people willing to do things that crazy don't last very long.
I am aware crazy people do exist. It's a matter of degree and I would suggest that flying this thought a forest Endor style would be far more dangerous than free solo climbing.
It's more or less like wingsuit flying, just faster and with obstacles much closer. So yeah, I would say orders of magnitude more dangerous than free solo climbing...
