Funny thing is that you just forgot to post this part of the text you got from Wikipedia:
Sex work can take the form of prostitution, stripping or lap dancing, performance in pornography, phone or internet sex, or **any other exchange of sexual services for financial or material gain**
First, the meaning of words is not given by the reason why that word was created, but by the way society uses that word. It's literally common sense that most content creators who produce the same type of content that Sophie does are sex workers. The creators who make the same erotic material as her refer to themselves as sex workers, on reddit there are several examples.
Second, sex work consists of providing sexual services and getting paid for it. This type of service is not restricted to physical contact. You are the one adding this rule.
Third, her not making explicit content doesn't mean she doesn't make sexual content and for me to have to say that is ridiculous. She posts photos completely naked, teasing buyers on all fours arching her ass, VIDEOS TAKING A SHOWER, videos massaging her breasts, messages asking you to cum for her... How is this not erotic content? Are you demented?