Usenet had the Cancelmoose, so message sanitization has always been part of the Internet. In this case, I see this browser extension as purely a tool of the end user and not a blanket threat to the peer community at large.
The internet has and will always be about increasibg the signal te noise ratio for the user. The fact someone resorts to blacklisting entire comment section tells us something about how they view the quality of these in general; subpar.
It isn't just LLMs which contribute to that. Troll farms do, too.
And my point is that the signal used to primarily originate from peer interactions, not broadcasting. Look at Usenet, AOL's structure, or Web 1.0. There's an inversion in the modern era, where broadcast messaging is perceived as the signal, and peer interactions the noise.