To me its okay to “demand” from a for profit company (eg google) to fix an issue fast. Because they have ressources. But to “demand” that an oss project fix something with a certain (possibly tight) timeframe.. well I’m sure you better than me, that that’s not who volunteering works
The X days is a concession to the developers that the public disclosure will be delayed to give them an opportunity to address the issue.
Why is Google deliberately running an AI process to find these bugs if they're just going to dump them all on the FFmpeg team to fix?
They have the option to pay someone to fix them.
They also have the option to not spend resources finding the bugs in the first place.
If they think these are so damn important to find that it's worth devoting those resources to, then they can damn well pay for fixing them too.
Or they can shut the hell up and let FFmpeg do its thing in the way that has kept it one of the https://xkcd.com/2347/ pieces of everyone's infrastructure for over 2 decades.
As to why they bother finding these bugs... it's because that's how Google does things. You don't wait for something to break or be exploited, you load your compiler up with santizers and go hunting for bugs.
Yeah this one is kind of trivial, but if the bug-finding infrastructure is already set up it would be even more stupid if Google just sat on it.