This is my point, WoW Token is not "play to earn", it's a way to get subscription for free if you have time to grind, and a way to get gold if you have money (which I would say is bad, because what's the point of having things that require time and effort, but can be bypassed with money? it really cheapens their value in the community).
While maybe it's not tehnically "play to earn", it's not that far away from it. Remember situation before WoW token was implemented? People were farming gold which they were selling to gold resellers. And then those gold resellers would sell the gold to those that have some extra cash and lacked the time. While doing so, shit load of people got scammed or even worse, lost their account due breaking TOS. I still remember my guildie loosing an account back in 2008 over measly 100 GBP worth of gold he bought as he didn't have time to farm it and all he wanted was that chopper mount.
So yeah, I say better have stuff like that implemented in-game, than let 3rd parties profit from it because if game is popular enough, they will show up.