I am not on Reddit, but, would making a subreddit private lead to difficulty in training the AI and collecting data?

I did not see a reason given. Anyone know why?

Let them weed the humans out. Then the bots can talk to each other over there and all the humans can move here!

Overall my opinion is irrelevant, however, I think there is a huge difference in knowing a person votes vs how a person votes. The how should not be public, imo.