Someone mentioned Million Dollar Secret on Netflix. It didn't seem my thing at all, but checking it out anyway it reminds me of a very old Belgian tv game show called De Mol (the mole). It may still exist, but isn't any good anymore, but the initial seasons I liked very much. It's from the time when there wasn't much television and everybody watched the same thing and discussed their theories next day at work or school.
Unlike this Netflix version, the mystery identity was also hidden to the viewer and was the same throughout the season. Due to the mechanics of that show the other contestants deployed the tactic to make themselves suspect as well, while now it's just about trying to avoid suspicion.
What remains, though, is that people are strange.
#MillionDollarSecret