These vendors blocked the specification because of their fear of the future. Web3 will not allow these entities to have control over their users or their data, ending the decades long surveillance and user data acquisitions.
On 1 Sep 2021, after multiple revisions and years of design and development by the W3C DID Working Group, the Mozilla Foundation filed a formal objection to block approval of the Decentralized Identifiers (DIDs) v1.0 specification. This is years after the Mozilla Foundation’s Internet Health Report stated:
The Internet remains decentralized, but the things we do on it every day are controlled by just a handful of global technology giants. These companies are starting to look more and more like monopolies of the past. Given the importance of the Internet in our lives, this is not healthy.
Soon after, it became public that two other formal objections were also filed. This time by Google and Apple. This means that three of the four biggest browser vendors had voted to block the DID 1.0 Specification.