Not 100% passive, but fantasy sports has been a nice side income for me this year. I used to play a lot for almost nothing, but then found daily fantasy games (pick a new team every game day, play against other people) and have made a decent return on my investment. I play on fanduel.com almost exclusively. If you have any questions or want some help getting started, send me an email (in profile). My referral link if…
It's formatted to be similar to poker sit-and-gos.