What is the purpose of blocking players?

If there is a player who you do not wish to be matched with, you can add them to your blocked list. This may be because they often quit the game without finishing or perhaps you find them to be a poor partner. If you block a player, then the matching algorithm will avoid placing you at the same table as them. Note: if you block too many players, this may cause delays in starting a game as you will have to wait for other players to be available to play.