Having a standard is not even possible technically when you have 1 player that is too good. Due to Hyrum’s Law, any small divergence from the spec will be observed and relied on. Why would you work against the spec which is nebulous, when you could be testing against 99% of what your user use?
It's not too good. It's just wealthiest. Because it holds ads market monopoly. Because it happens to be the popular search engine at the same time.
But it's not the best. Firefox is on par (I know they get some (most?) payments from Alphabet). And people were using Firefox/Netscape browser long before Google existed.
