Google routinely implements, fails to implement, and fails to deprecate features that align with their company goals (i.e. namely collecting lots of data). AMP, Browser Extension Manifest v3, cookie privacy features, ad-blocking features, file formats, and many more that most people have never heard of.

Happens all the time. Without Webkit and Gecko, the web would simply be "whatever Google wants to do". Having multiple browser implementations helps balance out whatever Google's agenda is at any given time.