No. of games for tournaments


In the 1400-1800 official chess.com tournament, in Defacto's group, there are two players who have only completed 3 games each on chess.com. That doesn't bother me--a player with 3 games is fairly likely to know the rules--but it implies the code checking that a player meets the entrance criteria may be faulty. Just an FYI for the staff.
Why must I have 'completed at least five games to enter tournaments'?