I think it’s reasonable to expect folks in the security community who go to the trouble of creating a website detailing security vulnerabilities in specific listed software to pre-notify the security teams of that software. The CopyFail website calls out Ubuntu and Red Hat specifically, but apparently the author of the site did not inform them of the issue?
But even if you think making unethical decisions in personal self interest is something no one should be criticized for, surely the Linux kernel team ought to have some process for notifying the top distributions of an upcoming LPE, just out of practicality.
In what sense do you believe that the reporter did not notify the security team of the relevant software? The vulnerability is in the kernel. Reporter responsibly disclosed using the kernel’s security report mechanism and waited until a patch was ready.
Distros are downstream of kernel, that doesn’t entitle them to expect to be contacted directly by every security reporter. That’s not on them. Distros that are big enough should be plugged into the linux security team for notifications.
Security researchers cannot be held responsible for broken lines of communication within the org charts of projects that they study. They’re providing a valuable public service already, how much more do you want?