> Afaik X is the only social media service that does this so far.

Facebook has had it for years.

https://www.facebook.com/help/320055788882014

Per your link, this isn't for every account. Just for pages that reach a large number of people. Good step though.

There really is no privacy concern to list the country of a user. I don't know why FB has to qualify it just for large pages only.

It's not really a useful feature because it's super easy to spoof once you know you have to.