Baseballs are safe in their most common state, but can quite easily send you to the ER.

"Hey, how about we have a game where we have one teenager fire a fast moving projectile through a space occupied by other teenagers?"

"Doesn't sound fun! Let's tell the other teenagers to get in the way of the fast moving projectile."

The drone lacerations may be a flashier image for a photograph, but baseball injuries are nothing to dismiss. Also note that all of the drone injury pictures I have seen are from the drone owner accidentally throttling up while holding the drone, which is an incredibly easily avoidable mistake.