Google and Adobe have become bandits
(Webm is not a codec; it's the Matroska container format renamed. VP8 is Google's codec.).
Adobe Flash built in to the "open" Google platform? I'm no expert on this stuff, but it's obvious to me what must be going on here. Google and Adobe are trying to incorporate elements they control into the open web. They want to guarantee a free lunch in perpetuity, as Microsoft did. Youtube is the lever, and Adobe has something else Google wants.
ANY video codec is going to fall foul of patents. There are at least hundreds of patents and numerous companies have patents in the H264 patent pool, not just MS and Apple. Many of those patents will apply to VP8 and Vorbis. If they gain traction as codecs, a patent pool will appear for them too; no different to H264.
Google says VP8 is not patent encumbered, but they are lying. They don't indemnify users of "free" VP8 code against patent litigation (as Microsoft does for PC makers using technologies included in Windows), and anyone who implements VP8 automatically loses their license to do so if they have a patent in a VP8 patent pool. (Google: "we're going to steal your ball, but you can play as long as you agree it's our ball now")
With no hardware acceleration, VP8 is a non starter for mobile. But Google can encode Youtube in a proprietary extended VP8 with hinting for hardware acceleration, get control of licensing hardware decoding. The "free" obfuscated C software codec will still work jerkily, but your battery will be flat. iPhone will be forced to take VP8 and Flash. Android phones will in practice get hardware decode before iPhone. Wintel PC versus Mac re-born as Android/Chrome gadget versus iGadget. Apple ground down into irrelevance again.
Adobe has been working on hardware accelerated Flash for ARM for several years (no result yet). Can you see what's going on here? An evil pact to lock a Google controlled VP8 and an Adobe controlled Flash into the so-called "open web". Google don't care that VP8 is patent encumbered, as long as they are in control. Whatever the license fees are, they'll be slapped onto the advertising charges and the handset costs - why would Google care.
And the trigger for all this? Apple's App store. Even Apple were totally shocked by the way users and developers forsook the open web entirely and dove into the proprietary app store. And what that meant to Google was that their search ad monopoly on the web wasn't going to automatically extend to mobile.
Paradoxically, the only company on the planet that seems willing to compete on merits is Apple. None of the others even wants to show up to a fair fight. This has been going on for so many years it's getting embarrassing.