Browsers have such a low switching cost. I like Firefox because it has seemed aligned with me against web advertisements. Not even privacy, per se, but web advertisements specifically. If it stopped being that, I might as well go back to Chrome, which works a lot better on a lot of websites. Not saying Firefox is evil now, just saying there is nothing keeping me around if I get the sense that it's changing in ways I don't prefer.
Sunsetting this feature doesn't indicate Firefox has changed their opinions. DNT was never effective, and provided a false sense of security. No tracking company respected it, so it just became a meaningless setting.
