If you play on a server that has customized zones, those are the places you will see most people playing. So, they aren't spread out all around the world. You will actually run into people pretty regularly in the higher population (50ish) custom legit server as long as you are in the custom zones.
Due to the nature of the emulator and accounts being free, a large portion of the player-base will play multiple characters at the same time so they can handle harder stuff by themselves. This means that some of them might not want to group with other people.
The emulator is definitely fun. I would recommend trying a few servers before you pick one to stay on for good. You can tell which ones are the most popular by seeing which ones have higher player counts. If they only have 0 or 2 players on them, they probably aren't that great yet. If they have 20+, they should be worth a shot. Obviously some people find them fun hehe.
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