The introduction of karma on this site wouldn't be a bad idea.
The system would work similarly to how Reddit works. If your comments/posts get upvoted, you gain karma. If they get downvoted, you lose karma. If your karma goes below a certain number, you should be banned temporarily/permanently from posting and commenting. Would help to filter out all the 10 year olds on this site
Create one hundred alts, downvote somebody you don't like repeatedly, get them banned simply through the creation of many accounts.
The perfect plan.
Duo doesn't even verify email addresses on creation of an account. I can't see them continually tracking IP addresses. I'd like some system to limit who can vote like you have to have completed a tree. Although I suspect some of the downvote fanatics are just tired of reading how do I .... For the two hundredth time
While Duolingo should keep an eye on accounts posting lots of downvoted comments, a Reddit-like karma is a bad idea, especially if viewable by someone else that the admins.
On Reddit, collecting karma has become an addiction for some, leading to people fishing for easy karma with low-effort content. Duolingo forums are already full of fluff, imagine what would happen if it also gave people imaginary points.