When a user is banned, the mods and admins are not at liberty to tell other users the reason or length of the ban. This is kept between the TFS staff and the individual user. Asking only results in speculation, which doesn't get anyone anywhere. Users are banned for violations of TOS and that is the only answer you will receive to this question. When the banned user returns, they are welcome to reveal the details of their ban should they choose to do so, however, they do not have to do so, and should not be harassed about the ban.