Probably a very small number of women against men who should know better.
If you're a regular guy who builds a normal relationship with a woman, and imports her to the US, and you have a good marriage, why would she abuse you in such a way if untrue? Those numbers must be miniscule.
But if an opportunistic old duffer that imported some 30 years younger girl back in the days when that was easily possible, and she used the mechanisms offered to her to escape their greedy clutches to make a better life, well, maybe those guys should have known better.
Some of the 'founding members' of this board are long divorced from very young women. We have some awful tales from women in the archives here about abusive men. Some of them deserve what they got.
It's my view that women abusing the Violence Against Women Act in the US was miniscule in reality. There are a lot of very damaged men in this endeavour. Some of them go abroad hoping to mask their negative traits. Their local women eschew them and they hope to have better luck abroad. FSU women are too canny to hook up with losers for long. Those blokes might do better in Vietnam or the Philipines.
Gormless old duffers used to post here about how they were aiming to fly out just the once to meet some bint with K1 paperwork in their pocket and bag some decades younger Barbie from Odessa to cook and slave for them in Idaho thereafter. All rubbish and those blokes got burned.
It's not rocket science: meet an age-appropriate woman and build a relationship with her over time as you would with any woman anywhere. Eventually you might get married. Some will live happily ever after.
Don't obssess about so-called scammers. Normal well-adjusted blokes with realistic expectations seldom meet them. There used to be a saying around these parts: If you can't do it here, you can't do it there.