Any examples that can help me understand?
Perhaps the advertising angle goes hand in hand with the above inequality. Ads are essentially buying real-estate in your brain. One way is to have exclusives (i.e., buying out the room), another is Yelp-style (pay-to-play).
Twitch Booby Streamers - A Crisis of Culture https://www.youtube.com/watch?v=ySypTRw8AvY (50:06)
If you've got the time, the above two videos are a great rundown of the current 'sexual streaming' situation on twitch by one of the first ever professional streamers. He can be a bit edgy at times, and there's swearing in the video if that's not your thing, but he has a solid, well thought-out opinion when it comes to most things. The whole situation is a mess, with crazy misogynist incel types on one side and Twitch on the other just sort of ignoring complaints and being complicit in the mass harassment of some of the women on their platform.
If you want some examples of their inconsistent application of the rules, you could check out many of the things LegendaryLea was given short temporary bans for, then compare it to e.g. the stream IamSSunny was permanently banned for, which was later arbitrarily reduced to a temporary ban - driving home just how inconsistent they are with their own rules. Mildly NSFW though, so I won't post any direct examples here.
A cynic may interpret that as the desired outcome. From a business perspective, independent YouTubers don't have much to offer the platform.
Framing it as if they only ban aggressively for actual nudity is unfair. They ban aggressively on all kinds of fronts, including very subjective criteria, they just do it very inconsistently.
For all I care, they can do whatever they want. But I do feel like they are hard to take seriously until they decide to apply their rules equally. They do not. They have egregiously played favorites in a way that is surprising for such a big and respected entity as Twitch.
The thing that sucks is, the irresponsible ways that Twitch and YouTube behave hurts everyone, because they try to sell ads on content they know advertisers wouldn't like, and when advertisers wise up they overreact and become adverse to supporting small content creators. They would rather have "safe," big content creators instead, where they can feel like they're getting their money's worth.