If you want to get even more real, the people who maintain the quests, usually the adventurer’s guild or the hunter’s guild in these stories, would pay for the quest reader. Probably the people who accept the quest requests would just tell the adventurers what to do, and bypass the entire board.

It would be in the guild’s interests to have illiterate people do quests even if they were poor, to control who got what quests, and not to let the adventurers get too smart. The guild would be able to scam them out of so much money that way.