What is the greater issue is that this kind of content being on Twitch is “normalising“ it in a space it should otherwise not be part of. The other point is that it is taking advantage of (generally speaking) a specific group of people with a natural interest in such visual stimulation. It’s demeaning them to nothing more than “come, sit, watch me make money whilst I take advantage of your view and donation” ..
if this is the kind of normalised content that is in the same list as gaming, that there is nothing wrong with it with advertisers or with Amazons principles, then we might as well have newsreaders wearing the very same clothing, normalise it everywhere.
if you are happy to have this kind of content freely available when someone is looking for gaming content, then all well and good. But this does not belong on Twitch, and no argument about “freedom of the female form“ to be used to earn money in this space will make this argument valid.