We had more than 380,000 DAU (Daily Active Users) from 36 countries with all good feedbacks on Google Chrome Web Store, but even so, Google always tried to find a way to get us delisted and sometimes removed... they called it "an automated review process that is not performed by humans".
Every time this happened we need to send several messages to all available email address to get our extension approved and listed again in 24-48 hours. After facing this kind of situation more than 12 times, we simply gave up and remembered that it's not worth trying to build a business (or App) on top 3rd party company, like Google or FB.
Google has blocked installing AdNauseam from the Chrome store and installing the .crx file manually.
Manually installing the developer package is completely unhampered.
On each restart, you will need to re-add the extension from source.
Google doesn't have much incentive to make it easy, but third parties (like Debian) do, and do a lot of the heavy lifting on an ongoing basis.
I have Chromium installed on a my Ubuntu desktop but I think I had to add a PPA to get it.
Priorities clearly higher in killing ad blockers.
Edit: I'm genuinely curious -- did they copy the actual assets from the original game, or did they just copy the style and gameplay (which would generally be legal).
Most of the more-or-less mainstream distros ship Chromium in their standard repos. In fact, they're more likely to ship Chromium than Chrome due to the fact that the former is FOSS and the latter is not.
Neither macOS nor Windows have such a philosophy of "prioritize the FOSS alternative", so Chrome is unsurprisingly the better-supported option there.
Does OS X/macOS not still come with a bundled installation of Ruby? Or is the version it comes with too old to use with brew/brew cask?
That's actually how I first started using Chromium early in my Linux days; I didn't really know the difference between Chrome and Chromium, so I just picked the one that was easier to install. Once I finally learned the difference, I consciously made the choice to use Chromium on all of my systems, even the non-Linux ones.