Google might be aiming to replace ffmpeg as the world's best media professor. Remember how Jia Tan (under different names) flooded xz with work before stepping up as a maintainer.
Google, through YouTube and YouTube TV, already runs one of the most significant video processing lines of business in the world. If they had any interest in supplanting FFmpeg with their own software stack, they wouldn't need to muck around with CVEs to do so.