The reason it's like that is because nostr and deleting things don't work great due to the decentralized nature. You can always use a chat but it has no moderation powers. You could add a little more power to the relay but a client would have to pick a preferred relay for a topic. Probably best to just accept the chaos.
I figured it was to prevent spam.
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I have seen a handful of spambots post to communities tbf.
And you cant6ghen unapprove 😿
Technically there is a delete event that can be used against a approved post to unapprove it but it doesn't work very well.