I'm not certain how random users feel when knowing their selection knowing it's being used to improve an algorithm. In this case, it's relatively easy for me to log the prompt and the option that was selected -- just doing it felt a little ... bad, and I'm a little too scared of GDPR for a fun project.
The other thing is humans sometimes select the funnier option even though it may not necessarily be the best one. In a Show Reddit post, the most upvoted response is a Game of Throne's character Tyrion and a brothel story.
https://www.reddit.com/r/FanFiction/comments/d5s9yh/i_made_a...
Open-sourced Code: https://github.com/jeffshek/writeup-frontend