Being on 'The Traitors' can rehabilitate a celebrity's image. It can also ruin it.

Peter Weber, Rob Rausch, and Phaedra Parks on "The Traitors."

Euan Cherry/Peacock via Getty Images

• Peacock's "The Traitors" is a hit competition show in which players outwit and deceive each other.
• Season four's breakout star is Rob Rausch from "Love Island," who previously had a mixed reputation.
• The show has become a powerful tool for a celebrity's image rehabilitation, PR pros say.

One might assume that TV personalities appear on Peacock's murder-mystery...