So, how will you treat screen readers? Will they see that question? If you hide it from screen readers as well, what's stopping bots from pretending to be screen readers when scraping your page? Hell, it'll likely be easier on the bot devs to make them work that way and I assume there are already some out there that do.

Nowadays bots use real browsers to "see" all the fields a human would see. They won't fill out those hidden to a human.