I think (emphasise on the word think) the reason why some people are so upset about this, is because so far the Graal iOS community is pretty well connected between servers. Most Classic players are kept up to date with the happenings in the other two servers and vice versa. Developers between servers are close friends.

Delteria having their own forums is completly fine, I made an account there a long time ago. But completly shutting out the graalians community is kind of like an insult to loyal graal players. It is almost like saying "We don't want to be associated with the rest of the graal mobile community", which can be understandable considering these are unofficial forums, but the fact that this site brings in hundreds of players everyday makes it pretty real.

Will Delteria lose any playercount because they shut out graalians? No, but it does keep them out of them loop slightly with players from other servers.