When I write stories (single author, just me) I understand that any risks I take or mistakes in representation are my responsibility. Maybe I'll choose to channel my inner edgelord, which I do sometimes, maybe I won't, but that's a decision I get to make. If I then put that up for public consumption, then I'm also signing on to criticism.
If I as a middle-aged biracial-but-white-passing-for-the-most-part lady decide that I'm going to write a story centered around a black family who grabs their bootstraps to come up in society and finds shelter with a kind MAGA family who helps them to see that really if they would stop seeing color they'd finally find success and wealth, and then I decide to publish it and then cry loudly about how the black cultural community center won't let me hold a reading there and nobody seems interested in my tale of how they can improve themselves--I mean maybe I should have expected that, a little. My creativity wasn't impinged at all--I already wrote what I wanted to. It's just that not everyone liked it. I'm sure there'd be plenty of other people who would be happy to give me a platform to whine about reverse racism, even. Well, maybe I'd have a better shot if I was hot or something.
You don't get to make people like your content. You don't even get to accept that they have to accept it. (just like some people reject any notion of "sensitivity".)
If you want to create Realistic Historical Mush and want to include rape/human trafficking/slavery/racism/genocide, I mean no one is going to stop you, you might find less of an audience than you want (or you don't like the audience that shows up for it because they think it's lame they don't get to do those things elsewhere--even if it wasn't a focus for your vision, many people will steer clear and other people will come FOR the fact that you proclaim that 'historical accuracy without modern sensibilities' is a point of pride).
If you decide to create a character on a mush that doesn't allow people to create prostitute/pimp characters or any reference to that sort of thing, and that's made very clear, it's not stifling your creativity to not allow you to be the only exception or to find a workaround. If anything, if you really have trouble stepping out of your pimp/prostitute rut, maybe it will inspire more creativity as you need to think outside of your usual box. And if you can't or don't want to, that's okay! Nothing wrong with wanting to play a pimp/prostitute, IMO. You just need to find a place where it's supported.
I find a lot of people I have personally seen on mushes in particular who balk at "stifling my creativity" are more wanting to not have to abide by the rules laid out by the mush. Or in the case of writing in general they don't like hearing about other people's anger/discomfort/hurt at how they might have chosen to wrote something. But that is kind of a risk one takes when one takes their private writings for their own edification/enjoyment and sends them forth for other people to consume.
Social tastes change. I can see it even in my own tastes in music/humor/ect. Julie Brown's Homecoming Queen's Got a Gun and several of her other songs are nostalgic and super funny to me, but understandably probably pretty not so funny to people younger than me or who grew up in different circumstances especially in the era of school mass shootings, and victims being harassed for being deep state false flag actors. It wasn't until I started watching films from the 80s that I loved as a kid with my own now late teens/young adult kids that I realized how rapey many of them were (or even stuff from the 60s and 70s). What was considered fine in the 90s is different than today, when it comes to cultural content in roleplaying games largely written for and by white people. I assume that things will be even more different when my youngest kid (now 6) is in his 20s.