Normally I don't pay any attention to rape claims on famous/rich people but I like to think I'm a decent judge of character. Overtime thoughts begin to manifest in the face. And Sam absolutely looks like a sister fucker.
Also, billionaires like Sam will give basically infinite money to family members. You can't possibly spend a billion dollars on anything that won't make money. So it's likely he did some fucked up shit and she wants the world to know.