So far I think that's been a good think on balance because they are good technologies. But it is worrying how much power Google has in this space.
WebP is a file format and doesn't fall into the normal standardization process. Browsers implement support for new file formats at their own behest.
Where one actor can also start using the new "standard" overnight and break lots of services for people which are not using their browsers... You know what I mean. It's some kind of enforcing to have a monopoly.
You'll note that they're also willing to kill features which are not adopted, like PPAPI.
After adding whitelists for Google properties like Hangouts, of course.