No one should be downvoted for taking their earnings on HIVE,
I don't think it is necessarily for taking it off Hive. However, why would they be encouraged to keep earning on Hive? The downvote can limit their future extractions, especially if the content isn't overly good anyway.
Yeah sure, shit content, shit self interested players, etc - absolutely discourage.
But your average Hiver who is trying best, engaging, powers down a bit because they need it, comes back, curates, gets involved as best can - they need supporting as much as the person who invests and never powers down. Otherwise it feels elitist to me.