WIBTAH IF I left my gf over Linigrie?

So for a bit of background I was married and am divorced. My ex wife always wore revealing clothing and thong bathing suits and would post pictures on social media. She ended up cheating on me and we got a divorce.

Fast forward to yesterday my fairly new gf was on her phone while my buddy and I were having a beer with my buddy she was on her phone the whole time. Not a big deal we ramble about work a lot. He left and she was still on it so I asked what she was doing. She said that she was filling out a survey to model lingerie for someone for free in return for getting the pictures for free. I asked her if they would be using the pictures for adverts and she said yes.

Later she asked if it was ok and I told her I refused to give my opinion and it was her decision. I feel like I want to just cut and run now. To me whether or not she does it now is irrelevant, the fact that she is willing to especially while in a relationship feels wrong. WIBTAH