I don't see a license change coming anytime soon officially allowing private servers being run by anyone, simply because the idea of the license is to have one consistent world with everyone playing on, to avoid a "split of societies" (like what you mentioned with your guild).
I wouldn't be too strict with the interpretation of the rules however myself when it comes to screenshots to show off the nice art of PS.
On the other hand, over a private server it's also possible to make screenshots of maps etc. and use them as spoiler which we certainly don't want (public).
From my understanding, Induane's comments are right. The license forbids the usage of private servers in general, with specific exceptions - those servers that are "licensed by Atomic Blue" which can be any on which the board of directors and members of AB agreed with.
I'd think testers and devs have a "general license" as in "note of understanding" by the AB people to run private servers to do what they need.
From this point of view encouraging people to run private servers without agreement from the rest of the devs and directors is wrong, but telling about the possibility to take screenshots this way for the benefit of PS.. shouldn't be a "bannable offense"
