Item — HN Reader

Birds do not come with exploding lithium batteries or large metal bodies like brushless outrunner engines do!

I do not think you understand how tight the tolerances are in a modern turbofan engine. Birds are relatively soft and get chopped up by the blades. Metal bits (like a drone will have) can break off or bend a blade. The imbalance of a broken blade will cause damage to the turbine instantly, which will cascade into further damage. (clearances are MILLIMETERS, if that, so any bending is a serious issue)

I hope they're testing vs. drones today for current aircraft. The old turkey cannon test isn't enough.

There are limits on what turbine blades can handle. Stronger blades are thicker. Thicker blades are heavier and harder to spin up. As it is, the insides of those turbofans are the bleeding edge of material science!