What's there to get? People, overwhemingly men, pay for adult content from performers, majority women.

It often involves a supposedly personal touch (like chatting with (someone pretending to be) them, or being able to pay for custom content).

Nothing really exceptional in any way other than scale, democratisation (anyone of age can sign up to post content) and the digital transformation. Back in the day people used to buy porn magazines with their niche preferences, and write in letters to share their stories / fantasies and get responses back.