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WMG is for speculating on potential plot development. Since there isn't much narrative to Kidz Bop, a WMG page isn't really interesting or relevant. Most tropes on the main page are about how the covered songs were changed compared to the original version, so if the page was speculating on which lyrics will be changed, that might count, but that has the potential for snark, so I'm not sure if it would really be OK.
Headscratchers is for discussing plot points that seemingly don't make sense. "Why didn't they cover song X" is complaining about an out-of-universe creative decision, which is misuse of the namespace.
As someone who participated in the thread Burke linked, I can tell you that "What song is going to be on the next album?" is not a WMG. That's something that can easily be put into a forum thread.
And there was a ban evader that frequented the Kidz Bop pages, which didn't help matters.
Keep in mind, there's a bug with the cutlist that means only the oldest cutting reason is shown, even if it was made years ago for a rejected cut attempt. It's always possible the "complaint" reasoning is outdated.
Currently Working On: Incorruptible Pure Pureness
Hi, I noticed that the WMG and Headscratchers pages for Kidz Bop were cut on account of being nothing but "complaining", but I don't see anything wrong about either of them. From what I remember, the WMG one was just users predicting what songs will be on the next album and the Headscratchers page was asking why the franchise didn't cover a certain song. I don't see what's so wrong about that. I do say it is a bit surprising how people actually take this franchise seriously enough to trope it, but I guess it's because it is well-known.