I’ve seen tags used well in general communities, like country specific ones especially. /r/newzealand was strict about their post flair so that people could filter out politics or shitposts if they didn’t want to see it but still wanted to engage with the other content.
Hacker News has a monthly Whose Hiring thread which has a remote tag in the template. There’s a website that pulls all the comments out and makes it into a job board of sorts but I can’t remember what it is.