No joke. It will happen, just as "Admissions consultants" for schools are already a thing.

It will probably be an AI-driven service. Describe the persona you want to project and let HAL take it from there.

The problem is that they already ask you to list all social media profiles, so if you had a "public" account that's only unobjectionable posts, and an "alt" account where you post your political activism posts, you either have to disclose the alt as well, or you're committing a felony by lying on a form.