I agree and she's obviously just joking around here rather than actually thirsting over pregnant women (I seriously hope I'm not rainbow-stickering right now), but at the same time when you already have a problem with people coming to your stream chat to masturbate, risking someone from that crowd seeing her posting fetish art as their first impression of her isn't exactly wise.
It doesn't really matter because the jannies can sweep up troublemakers either way, but I can see why someone might just have a "Pippa, come on" reaction to it.
I will say, and this even extends to the actual shameless fetishists, there is a huge difference between someone posting whatever they feel like on their Twitter account where it's out of the way and people who don't like it don't have to follow them, versus posting something explicit in a stream chat where it's involuntarily forced on everyone who using it to post their safe-for-work reactions to the live entertainment. Obviously this is nuance that random attention whores won't pick up on and that's why what I said above applies, but I think that's on them for being retarded, all she's guilty of there is overestimating people's intelligence.