The short version is that the W3C approved DRM (Digital Rights/Restrictions Management) and the process was not very open. The inclusion of DRM within the W3C standards has been fought against for years, after an appeal the decision is final: The W3C is no longer for the open and accessible web.
The W3C has been a key component in the open web, however with DRM it has clearly changed its direction. The pressure of big media companies such as Google, Apple and Netflix has hit hard and the W3C principles have been bought. (I think their new motto is "Don't do evil" or something like that.)
The EFF (Electronic Frontier Foundation) has resigned from the W3C. Thanks for that.
Read more about this on better articles: