'Survivor' producers have threatened to sue after a couple contestants broke their NDAs by posing together for a photo -- but only punished one of them.
Sources close to the production told TMZ that contestant Alec Merlino got the brunt in the discipline department after Instagramming a photo with fellow contestant Kara Kay and captioning their pic with a defiant "F*** it."
Sources say showrunners are withholding his appearance fee for the show, which comes out to about $10,000. He's also been uninvited to the finale episode broadcast, where he would come on TV to reminisce about the season.
We're also told a warning email was sent to the rest of the cast telling them about the situation, and advising them not to follow suit....