What a weird polemic. "With Google WebComponents here we mean the use of CustomElements and Shadow DOM, especially when used in combination, and in dynamically created document structures (e.g. using module loading/unloading and/or slotted elements). ... WebComponents used "in full" (i.e. dynamically) inherently creates complex web page structures that cannot be saved, archived or even displayed outside of the designated targeted browsers (primarily Google Chrome)."

It's a web API. Browsers implement it. Including Safari and FF. If the argument is that it's hard to implement and makes it harder for new browser implementations, the same could be said of new CSS features, other APIs like Web Audio, etc. Trying to brand Web Components as Google-only may have worked in the v0 prototype days in like 2014, but it's factually not the case today.