Multi-level marketing (MLM) is a direct sales strategy some companies use to encourage existing distributors to recruit new ones, offering them a percentage of their recruits' sales. It's a legitimate pyramid scheme. What separates it from the illegal ones is that distributors can make money not only through getting people to enroll into the program but by selling products as well.
However, regardless of legal status, a lot of people have lost money after they got into MLM—even for those companies who are considered legit, the bulk of the profits come from recruiting new members. This was covered well in this segment of HBO's Last Week Tonight with John Oliver.
Many huns (people who shill products/services for an MLM; the sellers have a tendency to frequently use the word 'hun' when initiating a sales pitch) are often trying to take their operations online, bombarding their contacts with obnoxious "get rich fast" proposals. So in an attempt to counter them and "stop MLM schemes from draining our friends dry", the subreddit r/antiMLM is trying to highlight just how ridiculous they can be. Continue scrolling and check out some of the most popular posts from the sub.