You can cope in any way you choose, but if you're selling sexual acts for the intent of another's sexual gratification, it's prostitution.
Hookers/escorts on the street are in control of who they fuck in most circumstances. In the industry, you need to be a huge star to have a say in your specific partner. You can refuse acts and niches, like no BBC or anal, but only the stars can dictate to the studio the individual actors with whom they'll perform.
"Prostitution is the practice of engaging in sexual activity in exchange for money or other goods."
It doesn't say sexual intercourse or stipulate in person.
If you hired a hooker off the street, went up into a hotel room and didn't touch her but still jerked to the sight of her nude body, what's the difference doing it with a computer screen separating the two of you?
Any answer besides it's prostitution is cope and puts porn girls on a pedestal. Furthermore, most of the adult industry escorts, like Fiona, so she's even by your definition a prostitute.
I'm not saying any this in a holier than thou way. I think prostitution should be legal and have rules. But I'm not going to lie to myself and pretend there's a material differentiation.