Based on the player ELO, players are placed into specific Leagues and Tiers.
A player needs at least 10 matches for each faction in a specific game type to earn a rank and be placed in a tier.
If a player remains inactive for an extended period, they lose their rank. However, they can regain it by playing just one game.
ELO is also subject to decay, if a player doesn't play for extended period their ELO might be lowered without playing any game.