While it was kinda lame for Mozilla to add it with it already opted-in the way they did
That’s really the rub here. Reading the technical explainer on the project, it’s a pretty good idea. The problem is that they came down on the side of “more data” versus respecting their users:
Having this enabled for more people ensures that there are more people contributing to aggregates, which in turn improves utility. Having this on by default both demands stronger privacy protections — primarily smaller epsilon values and more noise — but it also enables those stronger protections, because there are more people participating. In effect, people are hiding in a larger crowd.
In short, they pulled a “trust us, bro” and turned an experimental tracking system on by default. They fully deserve to be taken to task over this.
Can we follow this up by murdering most of the generic Top Level Domains (gTLD)? I have yet to see anything except spam and malware coming out of the .top domain.