It's a topic of discussion in the self-publishing world. Some authors are hiring them to try to avoid getting "canceled." The problem is that these sensitivity readers only specialize in certain "triggers," such as sexual assault, gender norms, race relations, cultural appropriation, etc. One would have to hire multiple readers to cover all the potential problems. Then there is, of course, woke culture changing the goal posts every other day. What was acceptable last year is now an unforgivable sin.
Then, what's left? It probably isn't literature anymore. More and more authors are banding together to try to stop the empowerment of this type of thinking. Ironic, I think, that those so far on the left have something in common with those on the far right. Ban the book, cancel the author... they're in good company together.