Although the PCU does not has its own lore, they do have quite an amount of RP-campaigns(bot RPPVP and normal RP) under their belt, so there are quite a few characters(and players) who know each other from there and it will be brought up from time to time!
But its not as bad as the PCU making up islands or suddenly having people declare themselves kings/Queens/Grand-Marshals of their own Kingdom(s) or such things!
Also I’d like to suggest:
Yea, its a PCU guild, but its Warlock-focussed! And its not stationed in Suramar! 