On some of the niche travel-related subs like r/bikepacking, it’s actually quite common to run into one’s fellow redditors in real life on some popular route around the world. You definitely know the high-value posts are coming from real people. Some posters aren’t anonymous at all, because they also have linked YouTube or Instagram accounts that use their real name and face. And from e.g. the person’s gear, the past travels they describe, or the internet drama they have witnessed, it’s easy to identity a person you run into as a fellow member of the sub.