I kept thinking that web.dev is the same as webplatform.org, which was positioned as a community-driven replacement for Mozilla's MDN Web Docs and heavily pushed by Google at the time.
Turns out webplatform.org was discontinued some time in 2015 and put up a notice pointing people at the MDN Web Docs. Then in 2017 Mozilla announced most of the key players (including Google) would now support the MDN Web Docs[0], which still seems to be true except they fired the entire MDN team in 2020[1]. It seems the advisory meetings are still happening and someone is maintaining MDN, but with Mozilla essentially only existing because Google continues to pay the bills, its future seems a lot less certain now.
Meanwhile web.dev makes no mention of MDN and instead mixes discussion of Google's proprietary "experimental" features and Chrome-specific behavior with general advice on "building better websites", duplicating some of the content already covered by the MDN Web Docs' guides section (except this gives them opportunities to cross-market their own interests while also not discussing support of features in other browsers).
I don't think Google is hiding who's behind as the footer literally has the Google Developers logo in it. They are however not acknowledging anything other than Chrome even exists and heavily blurring the lines between Chrome or Google-specific features and stable web standards. Coupled with certain public Google developers continuously chanting "use the platform" while criticizing people for using other web frameworks instead of custom elements, this certainly creates an impression of deception and dishonesty.
[0]: https://blog.mozilla.org/blog/2017/10/18/mozilla-brings-micr...
[1]: https://www.fastcompany.com/90539632/mozilla-vows-mdn-isnt-g...