As in another comment, adding code/fixes only adds more work to the existing ffmpeg team as they need to review and maintain it forever. It's not good enough. Even security fixes in the style of "drive-by patching" are derided in security-oriented open source projects.
Adding code/fixes is a tiny fraction of work compared to reviewing and maintaining.
The only reasonable way is for Google and other big corps to either sponsor members of the existing team or donate money to the project. And making it long term not one-shotting for publicity.
It's frustrating to me how many people are siding with FFmpeg here considering how unprofessional and generally asshole-ish they are being.
I feel that this is mostly a kneejerk reaction to AI and Google in general, with people coming up with arguments to support their reaction after already forming an opinion.
It's a volunteer project, they have no requirement to be 'professional'. That's basically the root of the whole issue. A hobby project is not a product, and its developers are not vendors. Free software is not a supply chain.