They said in the QA that the fun measurement system is:
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How frequently do you log in?
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How long do you log in for?
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What activities do people do?
If the answers are:
Often
A long time
and doing the same thing every time, then they know that thing is fun. Otherwise, their logic is that people would not log in often to do it, or spend long amounts of time doing the same activities unless those were “fun”.
For me it works like this beginning of expansion, I come in and play until pathfinder 1 is done. Then, I do not log in for months - this time it will be pretty close to a year before I play again (it appears). Then, the “.2” version of the expansion releases and I get flying. THEN I level all 30 of my alts. This is the cycle of my playing since, for me, fun is leveling alts and flying. I made a quasi exception this time because I wanted a Zandalarian Paladin, so I made one and got it to BfA level and will not finish leveling until flying is unlocked in BfA.
So, they can potentially get me back for allied races as I will register on their “funometer”, however, this only applies to trolls. So, if they make new trolls playable, or if they do my idea on the link, then I will log in to level several versions of those troll types. Otherwise, it’s back to the cycle of “The game has what I want when I can fly”. This works for anyone in their play style. Obviously, no one will log in to do stuff they do not find fun.