INA §212(a)(2)(D) renders inadmissible any alien who:

(i) is coming to the United States solely, principally, or incidentally to engage in prostitution, or has engaged in prostitution within 10 years of the date of application for a visa, admission, or adjustment of status,

(ii) directly or indirectly procures or attempts to procure, or (within 10 years of the date of application for a visa, admission, or adjustment of status) procured or attempted to procure or to import, prostitutes or persons for the purpose of prostitution, or receives or (within such 10-year period) received, in whole or in part, the proceeds of prostitution, or

(iii) is coming to the United States to engage in any other unlawful commercialized vice, whether or not related to prostitution

Obviously these people should be applying for EB-1s since that is the established visa program for prostitutes.

If they stream the sex on their OF feed, then it's not prostitution. Even if model is paid by the other person, it would be difficult to legally separate it from any other adult entertainment contract.