You didn’t read the articke, did you? According to the study cited in thr articlr People on average loose 4.5% a month:

> one longitudinal study of nearly seventy thousand Dutch retail investors. The findings back up the story of the current wasteland of retail traders over the last two years. Over six years, researchers found that retail investors who participated in options trading lost, on average, 4.5 percent monthly, more than halving their accounts within a year.