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...
If the user does something with their device Google dislikes, Google can block the user from using Google services, or if they're doing something illegal, they can go that route.
This habit of retroactively removing functionality from devices is not OK. If Google relies on a business model other people hate, perhaps they should give some thought in to doing something about that.
Most large tech companies want to get a noose around users' necks. If you stick your head in the noose, guess what happens?