Or use a powerful enough laser pointer. Bonus points if you use infrared since other humans can't see the beam and won't know what you're up to.

Though you either need a laser powerful enough to harm human eyes or lots of patience. Hong Kong protesters innovated a lot of these sort of resistance using lasers

So you can do it without your image being captured by the camera?

I don’t think they make commercial paintballs with hard to remove enamel or tempura paints.

Last I heard, putting a glock on a quadcopter was creating an "illegal weapon system" or similar fancy sounding BS but I wonder what the accusation would be for a paintball gun on a drone?

Must less recoil too.