To make players feel more secure about idling in public channels, all server channels with the market bot (TRBot) have now been set as +u, or "Auditorium" mode. This mode hides various information from users such as the non-operator users in that channel, nick changes, joins/parts, etc. This means the only way of knowing if someone is in the channel is if they say something.
Mode +u has been set on #arch, #beta, #blitz, #guildwar, #lightning and #solo.
If you have any queries, look for someone in #help.