My message was then promptly sent to the very same hiring manager running the show, and the local director who was equally involved. Obviously, nothing positive came out of it, and there was a fair amount of unpleasantness afterwards.
Back then I was younger and somewhat naïve, but fortunately that mindset changed quickly. None of these hotlines or whistleblower mailboxes work as intended. More often than not, you just end up creating trouble for yourself and for others with a net negative outcome while the original problem remains unaddressed.
The people in the positions of power have everything going for them, it's in their interests to maintain status-quo and expand their spheres of influence. The last thing they want is for an upstart whistleblower to try and make a change.