I don't care about influencers or only fans girls, but what's the difference between a girl posting on only fans and a girl stripping in a seedy club? Other than she's actually safe in her home.
People used to ask why pretty girls would "waste" themselves taking their clothes off for dollar bills. The oldest industry is prostitution. They don't still have adult movies for rent in every hotel for no reason. People will always pay for sexual gratification.
If it's not your thing, so be it. But I don't see any reason to stand in the way of a person who wants to use their sexuality to make money or the people willing to pay them to do so.