Or perhaps people just don't want to have to pay a central licensing entity to use a video codec? I'm sure Google stands to save a lot of licensing fees if they don't have to pay into MPEGLA's patent pool. It has nothing to do with FUD and everything to do with wanting an unencumbered format.
Edit: This is the same reason that most video games these days use Ogg Vorbis for their music and sounds, because they save a lot of costs by using an unencumbered audio format.