Chrome is, however, proprietary and driving further that way. IE6 showed that a single, dominant browser is not good for consumers or progress. Especially when it originates from one of the two leading surveillance tech firms.
[As an aside, I was disappointed to see MS admit defeat with Edge and jump into bed with G. Still seems a bit suspicious tbh].
You don't see people complaining that GHC is de facto the only Haskell compiler.
Sometimes. But motivation matters. The motivation behind ghc is clearly and unequivocally to advance the Haskell ecosystem. The motivation behind Chrome's dominance is another thing entirely.
Microsoft threw the towel for this very reason. It is quite hard to keep up when you have an implementation used by more than 70% of the market, because that makes it the de facto standard, regardless of what the standard really is.
We are going to see the same issues as with IE6: chrome does (and breaks) things before the standards are updated, and dictate huge chuncks of poorly-thought features on the web platform, that might become required for any kind of serious business (think flash, java, silverlight, widevine).
This really is the E part in EEE (the middle one...)
Given that all the relevant bits are in Chromium (sans Widevine, which is a whole subject on its own) this is not a strong argument.