I started in vanilla, raided everything including naxx 40 (only killed like 6 bosses though to be honest). And I don't want vanilla servers back, the gindyness of vanilla was a super boring grind...I picked up bad habits of being a crazy packrat and vendoring every possible thing because of how much of a PITA it was for me to make gold. XD;
I don't see why this was a surprising move since that is technically blizzards property they were using, paid or not doesn't matter...they don't own the material they ripped out of the game for their servers.
Also trying to claim that its just so they can get people to play Legion is silly, wouldn't it have taken them some time to get through the legal process of getting this server shut down?