AdNauseam is silently clicking ads. This directly costs Google money. Google happens to control the extension web store for their own browser. Removing it from the store really isn't that bad. Uninstalling it from existing browsers as malware? A little more malicious, but I would still consider it self defense.
There is even a method to install it directly[1] which AFAIK Google has not blocked.
Granted, if Google were not both running the browser and the ad network, these actions probably wouldn't have been taken. But the whole attitude that this is some sort of tyrannical thing is a little over the top.
1. https://github.com/dhowe/AdNauseam/wiki/Install-AdNauseam-on...
Edit: Keep in mind I'm referring to developer mode installation per the link above, not directly installing the extension package from the store or a file.
The good thing of course is that it shows that they are afraid of such an extension.
Seriously. I'd figured they'd filter these "clicks" out easily server-side and didn't bother to install this thing, but this ban has hinted otherwise. I'll be installing it everywhere I can now.