AITAH for outing my ex?
So for context, my ex-wife was a SAHM who I found out was dropping our son off with her mom so she could cheat on me and told her mom she got a part time job. I found out from her leaving her Snapchat connected to our iPad and got notifications of multiple men she was sleeping with. She also remarried a few years ago and cheated on her new husband, although they're still together and she's still a SAHM. She hasn't had a job in over a decade.
Recently I was sent videos from someone who I met through her of my ex making "relationship coach" videos and giving advice. She's an attractive woman and in her videos she was wearing provocative clothing, usually just a push up or sports bra and shorts and has catered more to men because of it, who were all commenting on how brave she was and "any guy would be lucky to have you." etc. I decided to make an account and commented, "I think it's hilarious you're making videos about relationship advice when you've been unfaithful in both your marriages with multiple men." I left it at that, but apparently that created a big rift in the men who were following her and sending her money through the app she was using. Now she's blaming me for loss of "income" and when I sent that to her husband asking if he knew, he did not. So now they're in a huge fight and he's now considering divorce because of it.
AITAH here, or was I justified in calling her out on her grift and possibly causing their divorce?