I'd argue the opposite: around half the population of the planet is instinctively and immediately drawn to the sight of a fertile woman with her secondary sexual attributes on display, while the appeal of pixels mashing into other pixels on a screen is much more limited.
Also, Amouranth does actual pornography for a living, her own interest is absolutely more aligned towards getting new OnlyFans subs than some platonic ideal of enjoying gaming for its own sake.
To be clear, there's nothing wrong with doing suggestive cosplay or things like that. I also doubt that the average person is going to watch Amouranth, and then immediately assume that all the women interested in gaming are curating the same kind of appeal - this kind of influence is more subtle than that. But I do believe that the juxtaposition of male streamers' content, and many of the most popular women's content likely fosters these stereotypes.