I find it concerning that software projects have to become CNAs to at least alleviate the harm of bogus CVEs.
There surely is some sort of CVE peer review? This should be possible for indefinitely long time after registering a CVE, because humans make mistakes.
So it shouldn't be needed to shy away from marking CVEs as invalid / rejected retroactively if appropriate.
It is understandable to err on the side of caution with vulnerability reports, but since reporting vulnerabilites has become an object of prestige, it seems needed to ramp up the scrutiny.