Alter Aeon Rules of Conduct

Rule 3.3 - Thou shalt not dispel other players without consent

Players are often affected by a lot of spells, and it takes time and
mana to cast and maintain those spells.  Casting dispel magic on a
player when they are fully spelled can cause all that mana to
dissipate into thin air.

Also, dispelling a player in battle can make you responsible for their
death if they die!

Don't dispel people unless they specifically request to be dispelled.