There are no content police and there are no rules. The community tag exists so that people from the community can add either categorization or editorial to a post. In the case of #whocares, a tag that fwiw I've never used, it seems to be both. It's worth mentioning that if someone thought it an inappropriate community tag they could change it and if more people agreed with the changed tag than the #whocares tag the more popular suggestion will prevail. If you "ignore" #whocares (EDIT: or follow it), then yes somebody is curating on your behalf. But I doubt many people are using it this way. My guess is that someone is trying to editorialize, to let you know they think whatever is tagged that is trite. If you disagree with their assessment, I wouldn't let it bother you. I mean, who cares?
I was alerted by a reader that I just got my first whocares tag. I didn't even know it existed
or that so many posts had that tag
I wandered down the rabbit hole and found you here.
So thank you to the whocares tagger. It led me to you. Again. You're everywhere.
One you've been on the site and participated enough to get "shares" and appreciation for comments etc, your hubwheel next to your name in the upper left corner begins to populate. Once it's made a full rotation you get some increased abilities on the site: 1. You get a badge to give. +! 2. You get the ability to add community tags to posts. +# Check out the FAQ page, I believe it's mentioned there. Hope this helps!