"We have X number of patents in our pool that we say WebM infringes on; pay us and we won't sue you." It'll practically negate the entire purpose of using WebM instead of H.264.
Edit: Until a court of law has ruled that WebM infringes on patents held by MPEGLA, what they're doing is quite literally the definition of Fear, Uncertainty, and Doubt. They want you to Fear a lawsuit, because you're Uncertain about the legitimacy of their claims, and Doubt that you could either afford the costs or even defeat their claims. You can't possibly tell me that FUD is inappropriate for this situation.
This despite the fact that MPEGLA has been licensing for ubiquitous technologies like MPEG-2 for over a decade.
So I guess FUD meet FUD.
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.
Are you sure about that? I'm sure a lot do, but I think a lot use WMA on Windows and XBox. I believe the encoder and decoder are free for use when developing games for those platforms. I think a different codec is then used for PS3 and Wii. I've certainly seen Vorbis used, but I think WMA is still used a fair bit more. I'd love to see evidence either way though.
Edit: some big names include World of Warcraft, Quake 4, Grand Theft Auto, and Eve Online.
The MPEG4 part 2 and AAC fees were such a "crazy amount" that Apple (!) refused to release Quicktime 6 as a result until the fee structure was changed.
Expecting the owner of IP to extract maximum value from it is hardly a conspiracy theory.
I'm sure MPEG-LA wants it's money by creating a pool for webM, but I see this as maybe removing the FUD by forcing Google to defend webM and hopefully knock down any patent claims submitted.