The linked conversation looked pretty civil - looks as though you decided to step down, which is entirely reasonable, but I don't see anything forcing you or imposing anything on you.
This isn't the same as bigcorps offloading their compliance costs to open-source ""vendors"". No one's obligated to do anything. The disclosure window is meant to address a tradeoff between giving the dev a chance to fix it, and minimizing users' risk until patch issuance. But if the dev can't fix it, the risk tradeoff shifts and you do have a duty to make it public for users' sake. You can't take it for granted that you're the first one and only one to have found that vulnerability.
