Earlier quoted context omitted.
As a nitpick, you’re describing coordinated disclosure. Branding it as “responsible” puts the thumb on the scale that somehow not coordinating with the vendor is irresponsible.
I would say that it is responsible disclosure. Or anyways, not doing that is irresponsible disclosure. The corporation may be hurt by early disclosure, and that’s whatever, but very often, there are a ton of ordinary people that are collateral damage, and the only thing they did wrong was exist in a society where handing over hoards of personal data to a huge corporation is unavoidable. So yes, anyone who discloses b…
I'm so sick and tired of some companies that any vulnerability I find in their products going forward is an immediate public disclosure. It's either that or no disclosure, and it would be irresponsible not to disclose it at all.