I say the day Mozilla bends the knee to advertisers and do what Chrome did by phasing out ad-blockers with Firefox. That'll be the day when I look around my apartment and realize "man, I need to start getting into some hobbies now."
I think the moment it becomes impossible to be annonymous on the internet.
I wouldn't want all of my internet traffic to be directly associated with my IRL identity. For me the internet has always been a way to explore oneself without having to worry about your school or job learning what you do in your free time.
I have been using the internet less and less because of this, but there are still cool places left, like the Fediverse.