But if everyone follows this advice, then everything just gets overwhelmed by "hustlers" (and their "shameless spam"), and collectively we're now all worse off because of it. It just turns into yet another tragedy of the commons situation.

I say this as someone who received a lot of great feedback and had some interesting interactions after posting about a project of mine using "Show HN" a few years ago. I didn't need to spam anything to get the attention, but I admit maybe I just got very lucky, or maybe there were just fewer posts to "compete" with at the time (this was before the recent write-everything-with-AI-and-launch-it-out-there craze).

Finally, I'm not making any moral judgments here, and if someone feels they need to do this to get the attention they want, then who am I to tell you otherwise. But we should be aware of what we're giving up when we overall tend to behave in such a way, even if it's the inevitable outcome.

Yes, this is why it's called a race to the bottom. If everyone does what is best for themselves then everyone's result will be worse.