Anyone can go to the Google site at any time, click, and be licensed for all future _and_past_ uses. So the only time anyone would ever actually need to do that is if they had been sued, and doing it would make the lawsuit go away. I actually think this is a pretty cunning solution if it's not possible to have a sublicensable licence (I suspect, with no evidence, that MPEG-LA didn't allow that).
As for the field-of-use restriction, expecting MPEG-LA to allow Google to give free licenses to all these patents without such a restriction is basically expecting them to blow up a substantial part of their H.264 licensing business. That seems somewhat unlikely.
Finally, comparing patent license agreements to the OSD is a category error IMO.
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