You betray your ignorance of how parasocial OnlyFans and their ilk get. Yes, people get real connection out of it, whether its with who they think they're talking to or not. I think that connecting those people into a chat bot instead of a real human is depressing, and a bad thing for society, but you're welcome to disagree with that
Talking to a real human seems more depressing to me, especially when they're making less than $2/hour doing it, have multiple chats going all trying to hit sales targets, and they feel bad for you in the interaction. Paying for female attention is pretty bad, but not even getting the attention you paid for is just bleak. At that point go with the machine. At least it's not thinking "what the hell am I doing here?" while it's generating messages.
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.