I've evolved my response. Originally, when I joined, I read the rules, and complied.
When others didn't do so, I didn't care that much, but when someone just posted without any participation, I simply didn't answer. . . and if the material was so good that I felt compelled to review it, I reviewed and added the advice that participation IS the benefit here.
For me, it isn't the "first post without reviewing" that is disrespectful, it's the "drive by first posts." Someone posts, several people respond with reviews, and the person posting simply disappears and is never heard from again. Doesn't acknowledge the reviews, and doesn't review anyone else. Occasionally, one of those "drive by and disappear" posters will post a second one.
THAT isn't about breaking rules, it's about being rude little twits. My current response is to simply mentally put them into the "ignore" category.
I've actually seen people request collabs, and then ignore all responses. That's not just rude, it's asinine.
I used to respond to these. Now, I simply wait to see if the responses to others get answered before I'll even think about reviewing, or otherwise responding to them.
I don't think there is a thing (rule-wise) you can do about it. These aren't participants, and they aren't members. There is literally nothing you can do about them. But they DO create a toxic atmosphere for better intentioned members - both newcomers, and veterans.
Much of the irritation toward first time posters comes from the frustration of reviewing a (previous) first time poster who simply disappears without a trace. I don't blame members for being leary after that happens.
All that said, the reason I'm here is that this is (by far) the best songwriter forum on the internet. There have been more excellent members depart from this forum (usually having a life beyond songwriting) than I've seen on any other forum.
And the folks who remain and contribute here now are incredible people, with exceptional intentions, and excellent advice.
All things considered, I suspect that not one person here (on any side of this "argument") has a bad intention. Nor are any of the participants here "wrong." I put it all down to "normal wear and tear" and "normal friction."
My advice is "It ain't broke, so don't fix it."