Should the PvP scanner Addon be allowed in classic?

Seams to me that this add on will break fair pvp. It is an unfair advantage over other players that do not want to use add ons.
This is what the addon does:
PVPScan is designed for pvp players and can be useful in many cases:

  • can protect you while questing warning about nearby enemy players.
  • help track enemies while fling snitching opposite players.
    Now it automatically warns you of nearby pvp players
    It automatically will help you track enemies.
    Does this sound fair?