Why does someone get tossed out of a face off in ice hockey?

A player is thrown out if one person from their team is trying to get an unfair advantage over the other team. This includes:

Moving the stick before the puck is dropped

Not placing the stick properly when requested to do so

Not placing the body square to the faceoff spot

Encroachment into the faceoff circle by a teammate.

When thrown out, another player from the team must take the faceoff, usually that person is not as skilled