Before I start my little theory, I know that gidle, and other groups have their accounts, but they only use it to answer the red carpets, you will understand as I explain.
Imo, maybe some (very very small percentage) of the 167+k users could be idols, like, just by the sheer amount of users this is feasible, a logic conclusion.
Now comes the tin foil hat part, who exactly is accessing the akp? I have some suspicions, that some Korean American idols, also some others that have a good english, could be accessing the place, like, not exactly super active, but just come here once in a while to see some posts and interact a bit, maybe they don't even comment/post, or they could just be ghost (without an acc) members.
Like, imagine having an argument with someone, when in reality that person is an idol, and can even be your fave/bias.
I won't name any possible gg/bg member or soloist which I believe access the akp, because just imagine, you find a place on the internet where you can chat a bit about kpop, and even talk with your fans, all anonymously, and one day, some minigee exposes you, its not right.
What do you guys think of it? Its not too far fetched, and again, its just my opinion, so in your pov I can be totally wrong.