There are also local newspapers. I do understand Nextdoor's motivation here, but it does seem a little odd. Journalists typically get stories by talking to people, and local journalists by talking to local people. Nextdoor is a specific avenue to do exactly that. And half the complaints on Nextdoor are things the author would probably love to have featured in the news (though hopefully they won't be, no-one needs to encourage the NIMBYs), and might be ones that would benefit from a reporter investigating them.

Private for them but everyone else can get rekt.

On the other hand, I'm not sure that it's actually a good thing to just throw up our hands and say that there's simply no such thing as expectation of privacy and, if it's that important to you, just keep your mouth shut.

That's how I feel when people say "oh there's no expectation of privacy cause you can just sign up with a fake name on a gift card."

That might have something to do with where you live. In our neighborhood, it's more of a status report on various happenings like crime, city projects, etc. Here's an example from today: someone posted they were putting a 9' x 6' Persian Rug on the curb, free for the taking.

What makes Nextdoor special over something like Facebook? Especially when you consider the origins of Facebook (school networks, etc).