I agree, I have it since the day it came out.
I guess I can see the issue here though. The old special mounts such as the yak were never removed this way.
But creating a feeling of "i have to stay subed to get this" is nothing new as you say.
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No, I'm not. But people are saying it's for all sorts of odd reasons but it's just as simple as them wanting you to stay subscribed during the period where they are not releasing any new content.
I get why they are doing it and I have no problems with it. I have the mount already.