I created !guildwars2@lemmy.wtf because !guildwars2@lemmy.ml does not have en active moderator and lemmy.ml itself is having a tough time dealing with the influx of new users, making the site very sluggish. It's getting better now, but the point of Lemmy (the Fediverse) is to spread out among multiple servers.
In the case of !guildwars2@kbin.social, which is different from Lemmy, I didn't realize it existed because a bug disabled federation between kbin and Lemmy. Were that to happen again, everyone on Lemmy would be cut off from !guildwars2@kbin.social.
kbin: This is a very early beta version, and a lot of features are currently broken or in active development, such as federation. Source...
!guildwars2@kbin.social does have 17 more subscribers, but !guildwars2@lemmy.wtf have twice the amount of comments ;)
Edit: Disclaimer: I am the maintainer (administrator) of lemmy.wtf