I subscribe to both those subs, and the signal:noise ratio is very bad. It's pretty obvious that there's a substantial amount of posts from people who have neither lived in nor traveled to these cities. I was visiting both subs regularly until I realized that they just made me anxious and depressed. Posts are frequently just signal boosts of lurid local news about rape/arson/homelessness/etc.
It's not something you see in subreddits for smaller or less popular cities with similar demographics. Subreddits for these tend to be actually useful.