I don’t think this is an appropriate topic–if you have an issue with a player or think they are breaking any rules contact a moderator (Either through the steam group, private messages on the forum, or emailing TBS) rather than starting a witch-hunt thread.

Closing and moving to off-topic, feel free to PM me or email TBS with the relevant information if you have a complaint to make about any players, but by the looks of it no rules have been broken (rank boosting through the use of custom maps is not against the rules as it does not give the players any special advantage and does not negatively affect other players).