Comment by grues-dinner

It would absolutely be fascinating. Unethical in general and outright illegal in countries that enforce data protection laws, certainly. Starting hundreds of microreligions that evolve in real time and bring able to track it per-individual and with second-by-second timings, and being able to A-B test modifications (or Α-Ω test, if you like!) would be the most interesting thing to happen in cognitive science ever and in theology in at least centuries.