I mean, it depends. They're not always peppers ghost. It's quite common to just use transparent projector screens, as peppers ghost doesn't handle viewing angles all that well.
These live displays are usually just some sort of optical illusion.
A real hologram shows you the actual light from the captured event as it’s the entire light field from the event. So your eyes are receiving essentially stored light.
Believe me - this isn't a battle worth fighting. At the end of the day, everything is an illusion. Vision is not reality.
Source: many a long year making digital holograms and trying to explain to people what it is I do.