Complete a survey and get TikTok coins or something like that, but you won’t receive anything as promised after finishing the survey(s). However, the affiliate marketer behind the survey(s) gets paid for the surveys you complete. It’s not a clear scam because you didn’t spend any money, just maybe some time, so it’s more of a grey area. The emails and data collected from the surveys are used for affiliate marketing funnels.
By the way, welcome to the world of affiliate marketing (many of us have earned from content lockers at least once along the way). Reverse engineer things to understand how it works and be part of the side that profits.