Nope. If a place decides not to interview you based on this, it’s probably not the most ideal place to work.
Some places definitely do this on purpose to try to gain the upper hand.
Always, unless it’s like a federal job tied to a set payscale. But even then, you should still negotiate for things like specific hours you’d like to work, hiring incentives, etc.
This is capitalism in action. Your labor is valuable and if you undersell your labor (e.g., take lower than what your specific market could offer, don’t negotiate, are not willing to turn down a bad offer, etc), you will likely be underpaid.
Some people willingly take lesser paying jobs for all kinds of rationale reasons (like doing a postdoc) but it’s one thing to do it willingly versus unintentionally because you don’t know better.
I’ve never been in PP so I can’t speak any specifics but I’ve seen a ton of old threads on what’s fair/unfair, common/uncommon and the general business side of PP. Good luck!