While I’m not against an anonymous stand for what’s “right”, that really was the tipping point for a lot of changes on 4chan.
It really fuelled the idea that anonymous should have some sort of goal of justice rather than just doing things “for the lulz”. It normalized the concept of shamelessly bringing your internet culture of choice out into the real world regardless of appropriateness (most of the protests were really just 4chan irl meetups, not really protests).
The biggest change was the sheer amount of public attention it drew to the site. That brought in a huge influx of new users who didn’t care to conform to the existing board culture (for better or worse). Things changed considerably following all that mess.
A good chunk of the internet in general as well. I don’t see how this is in any way enforcable. So fucking many things do this.