Nice one! Back in 2012 I built the (now defunct) Freakonomics Experiments site[^1] that used had the same A vs. B premise using John Walker's HotBits[^2] from Switzerland.
In case of interest, Steven Levitt published their - albeit single-Universal - findings in "Heads or Tails: The Impact of a Coin Toss on Major Life Decisions and Subsequent Happiness"[^3]