According to Classic/TBC streamer Kargoz, content creators have been told to delete their TBC private server content if they don't wanna be removed from the TBC beta list. : r/classicwow
WoW Classic servers: How to choose for Burning Crusade Classic | PC Gamer
WoW Classic & WoW Classic TBC Server Populations
TBC Private Server | Endless
WoW TBC Hunter Night Elf Level 70 for Europe Server - Zandalar Tribe
Burning Crusade legacy server 'Felmyst' shutdown by Blizzard hours after launch | KitGuru
wow TBC server
A Formal Request Thread for Fresh/New TBC Servers - Burning Crusade Classic Discussion - World of Warcraft Forums