In summary, I can take any of your (or anyone else's content) pass more pagerank to it than the original page and then I become the original page. Not only that but all your inbound links now count towards my site and I can see your links in Search Console of my domain.
This is something link graph theory refers to as "link inversion" and is very harmful to smaller publishers.
I can't speak to that particular exploit, but no matter what you always go to the vendor privately first. Period. If they are uncooperative you can then go public. Not before.
I'm not sure how to respond to your comment (for the record I didn't downvote you). The free market point was obvious to me, but I'll elaborate.
When he chose to expose this bug, either he wasn't aware of an alternative (so called responsible private disclosure) or that alternative just wasn't appealing enough. Since we're dealing with a company that generates income (indirectly) through the product, they risk financial consequences from this sort of exposure. It follows that doing more to incentivize and generate awareness of their disclosure policy would reduce their risk which would have a financial impact. It's up to them to decide how much to money / effort / resources to spend on reducing that risk.
My stance is that public shunning doesn't solve the problem of releasing buggy software. I'm actually a Google fanboy, but (to me) they could do better. Instead we get "The site is completely removed from their index without any notification." Maybe we need to elevate browser security to the level of Space Shuttle safety? Obviously that costs more and takes longer, slowing innovation, but IMO the market should determine that.
TLDR; The idea that the individual is responsible for exposing a companies bugs is completely absurd to me. I'll respect you having a different opinion on it.
In summary, I can take any of your (or anyone else's content) pass more pagerank to it than the original page and then I become the original page. Not only that but all your inbound links now count towards my site and I can see your links in Search Console of my domain.
This is something link graph theory refers to as "link inversion" and is very harmful to smaller publishers.