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Depends on how smart she is.
To not sabotage things, you can always leave it at a “mix of luck, talent and hard work”. And you’re working hard, and maybe you even have luck, but step dad might have all three.
If she’s smart, you can drop the whole thing on her: first of all, you love her, her mom loves her, her step dad hopefully does too or at least likes her and that has nothing to do with money. Then you can just be transparent on how much you earn, how much time that means in effort, and how much “lots of money” takes to earn. Then you can just do some math, and her step dad’s numbers won’t add up.
It’s a sensitive topic though, you can say your piece, communicate with your ex and the step dad about that she asked and what you said. They might have a different take.
Might even spin it into making her think about what she wants to do in the future.
He does content? He can be a bit aggressive about his topics, that can rub people the wrong way.
I don’t think he did anything offensively, legally or morally wrong.
I know just he exists, I don’t follow his content.