Это типа самый умный ответил?) А ты лицензионное соглашение-то хоть читал?) На вот, почитай
-- If you run CircleMUD, you must not require any type of fee or donation
in exchange for being able to play CircleMUD. You must not solicit,
offer or accept any kind of donation from your players in exchange for
enhanced status in the game such as increased levels, character stats,
gold, or equipment.
-- You must not solicit or accept money or other donations in exchange for
running CircleMUD. You must not accept money or other donations from
your players for purposes such as hardware upgrades for running
CircleMUD.
-- You must not sell CircleMUD. You must not accept any type of fee in
exchange for distributing or copying CircleMUD.
-- If you are a CircleMUD administrator, You must not accept any type of
reimbursement for money spent out of pocket for running CircleMUD, i.e.,
for equipment expenses or fees incurred from service providers.