Those norms do not exist. Those are people asking companies to do stuff to benefit the person complaining for free, and many companies will not do that.

It seems to me you're unaware of them, but there are strong norms around disclosure. They've been discussed for decades. It is the expectation that vendors would be notified in a scenario like this.

No, there are users who want those to be norms. Qualified researchers happily sell substantive vulns to people who pay (Governments/Cellebrite and companies like that) enough to quell any complaint.

Which is again, irrelevant to the question of how disclosure works and what expectations there are around it because that is not disclosure and is not what was being discussed.