They are basically cops. And the analogy holds on many level including that yes, some can genuinely be on your side and try to help you or fix the system from the inside, in a way, but it’s pretty much “luck based”, you have no foolproof way to tell one from the other.
The wise strategy is to be your own HR, study the contracts and the laws. If you go in blind trusting HR you can be lucky and have a good happy professiona life or get fucked.
Knowing also helps dramatically in undestanding where HR can realistically help, where it can harm and where it is going beyond expectations and is on your side.
Don’t expect them to put you above their own survival though…
I think revenues also shifted from selling music to using cheap music to sell concerts.