Tunare didn't really have raid guilds.

[cd288]

With respect to OP, yeah open/multi-guild raids existed on most servers. Not all the time, but it was a thing that happened at various points on most servers. At the same time there were guilds that were larger and more coordinated and didn't need to combine together with others to take down content. but yeah early on your ability to raid was much less tied to being in a "raiding" guild.

The open/combined raids happened less and less on most servers as the classic timeline progressed however. A combination of increasing player base size, knowledge of strategies and spawn timers, and pixel lust caused being in a "raiding" guild to become much more of a thing. Certainly by Velious I would hazard a guess that the vast majority of servers had one or two major raiding guilds.