There are also bots, Reddit is full of them to help their IPO. But you don't need to pay shills, libs will shill of their own accord if you just create an echo chamber. That's what the modding does.
Same thing in worldnews, which used to show cracks of left sympathy until they began banning anyone critical of capitalism.
I really don't actually believe those are real people on that subreddit. That's why I never cared about it. You can't convince me it's anything other than bots talking to each other.