My :twocents-02cents: on a few topics mentioned here:
A prime example of camgirls thinking that something is expected or required of them would be all the girls who've posted here this year asking if they can cam without doing penetration. It feels like an expectation if you've spent any amount of time on a camsite, as it seems like every model is doing public cum shows with dildos. However, there are several successful non-penetration models, as not every viewer is looking for or prefers penetration. Yes, they seem to be slightly in the majority, but only barely - for every two guys who want to see me use a dildo, one prefers clit play only. The same goes for using toys - for every two who want to see a dildo or vibe, one is more than happy to see me just using my fingers. Many girls are not aware of this, however, and may end up using toys and/or doing penetration even though they're not comfortable doing it, because they weren't aware that there's a decent profit to still be made without those options, and they're doing what they think they HAVE to do in order to earn money. When they later learn that they can get off however they want and guys will still be happy to watch it, it may be easy to make the transition, or it may alienate regulars. It can be a tough choice.
Personal example:
I've done a show I was mildly uncomfortable with before because I needed the money, and mid-show decided that, once the show was over, I would never do that again. It was a play session on KinkLive, which is like a gold show on Streammate, so I couldn't end the show or I wouldn't get paid, but he was way too bossy for far to little money. He was one of the oh-to-familiar Internet "doms", who enters a chat and instantly begins barking orders, and calling the model slut/whore/slave. There are folks out there who don't realize that just because I am A submissive, it does not mean that I am YOUR submissive, and you need to earn my respect before you start to command me. I did one thing for him in free chat, then told him that if he wanted more, he'd have to take me private. Instead, he proposed the play session, which I normally would not have acquiesced to, but it was just what I needed to reach payout on that pay period, which ended that day, and I had a bill that I needed to pay with that check. During the show, and after it, I decided that, in the future, sacrificing my self-worth just for a paycheck isn't worth it, and going forward, I would only do shows like that in private, where I'd be properly compensated for what I'm worth for dealing with that behavior - if I even feel like dealing with it at all that day. My asshole tolerance is very low, and some days it barely exists, but I can usually manage to be polite about it.
On to seeming-submissives doing dominant things: I can be one of those. When it comes to physical kink, I prefer to be the one being tied up and beat on. I love it. When I try to physically top others, I don't really succeed because I'm uncomfortable. But when it comes to the mental side of kink - humiliation, control, and the like - I far prefer to be the dominant there, though there are situations that I'd enjoy being the submissive with someone I trusted. My sexuality is pretty mentally based, so knowing that what I'm saying is turning someone on is incredibly arousing to me, and if what I'm saying is mean, it's resulting in a strong reaction and adding to my enjoyment of doing it - kinda like being a bully, but only if the target likes it. I'm usually pretty sweet and friendly on cam, so it can surprise people when they learn that the other side of me exists, but that doesn't make any aspect of my personality more or less me.