I have lost friends and family to this nonsense. Both literally, to antivax Covid deaths in '20-'21, and figuratively, to the insane and ever-escalating pizzagate-style conspiracy networks from which adherents rarely emerge.
Would you count those as fact checkers?
I would. Reality is the best fact checker
Several Republican friends are dead now due to Covid because they believed the anti-truth ideas being spread by GOP media about the vaccines. Darwin awards are indeed one of the ultimate fact checkers.