There are different kinds of camgirls. The American version are calling themselves "egirls" (which has a couple of different meanings, but recently murdered Bianca Devins is referred to as one, and may have referred to herself as one).
Camgirl, to me, involves streaming what is essentially a personal *advertiser censored* experience (and yes, I do have students who do this or do online stripping). But introductions and interaction videos are also a thing.
I too know women who have made or currently make a living out of their online work. It is not always what I would call "sex work" either.
How do you know you have students doing this? Do they tell you? Do you ask them? Have you seen them?
Not trying to get off topic, but that comment astounds me that you would know this.