Moving some of the villages’ poorest people to the most upscale housing upset established hierarchies, and some of the lucky participants were initially treated as outcasts. Rumors began to circulate—for example that the homes contained a secret room one could enter but never leav

The problem is that wealthier families likely already have better health outcomes. Not exactly a "randomized controlled trial" in that case.

This study seems poorly designed if they didn't anticipate this outcome, though.