It's really funny to me how everything has been twisted into "omg they jealous of bts".
Most of these agencies couldn't give 2 fucks about BTS enlistment being postponed. In fact, they might even be in favor since many new groups are piggybacking off of BTS bringing more western fans into the picture (you know how many start out as armies and then drop BTS or start ulting other groups over them when they check out other music? A WHOLE LOT. BTS is a very convenient gate to kpop that many agencies use).
OBVIOUSLY this is about about trying to pressure government into delaying for if not all, then most of other idols. The other agencies really don't care if BTS enlist now - or in 2 years time. What they care about is prolonging their own idols shelf-life (and it doesn't really matters to them how they do it - using public opinion or court loopholes declaring this excemption unconstitutional).
Wanna know why? Because boy groups are the moneymakers for most agencies. They sell the majority of albums, merch, and concert tickets - even if they don't chart as well as gg (or at all for the matter). And most BGs, especially from smaller agencies, have a clear deadline. Most of them either can't pick up the stream back up after enlistment (CNBlue, from the most recent ones - which hurts my heart bc I love them and their comeback was great) or simply being uninterested in reuiniting, no matter how successful (Infinite, for example, would likely be VERY successful if they got back together - but members don't seem to be into the idea).
Ironically, Lee Sooman, who's probably been dragged thourgh mud the most after these news, has the least to lose. SM groups have already proven to be the most likely to not only survive enslitment, but keep the momentum (TVXQ had their hightst grossing tour after discharge + both members have put out solos each selling over 100k; SuJu and Shinee both put out their best-selling albums after getting discharged, EXO is likely to repeat the fit after all the members are discharged unless something goes very wrong - but we'll see). Other than SM groups, there are only a few we know could repeat this fit - BigBang is the only one that could surely do it, 2PM and Highlight have a chance, but it could go CNBLUE route.
So yeah - agencies want to prolong shelf-life of their moneymakers and they will throw BTS under the bus for the chance. This is business and it's all about making money. Nothing to be mad about