They seem to be overworked and are underweight, and like
@Strawberrypie mentioned they are being abused and exploited. Beomgyu has struggled with depression, huening kai has his weight mentioned a lot and there's their weird manager that's always around touching him, and like strawberry pie mentioned, there are some hinting that taehyun might be going through abuse/ trauma, I posted about it before, if you watch JD Kpop and Sofia's videos on youtube they mention it. One instagram post I saw also mentioned his pinpoint pupils and how it could be a sign of trauma. Yeonjun seems to take out all of his frustrations on his members, he's usually very aggressive with fanservice. Nowadays I see no light in his eyes.
However he is pushed alot more compared to his members and gets a lot more opportunties, and it seems like Bang favors him over the rest of the members in the group. It was announced a couple days back that he will be featured in a japanese magazine. And if I recall correctly this will now be his second solo photoshoot.