From aad .org:
“For some people, nail biting may be a sign of a more serious psychological or emotional problem. If you’ve repeatedly tried to quit and the problem persists, consult a doctor. If you bite your nails and develop a skin or nail infection, consult a board-certified dermatologist.”
So, here’s something else Evans can tell his Patreons that he needs their money for,... seeing a psychologist for nail-biting.