Free downvotes are definitely needed. I don't even care about healing until it becomes excessive. If someone is taking away less than 10% of your rewards, getting healed is pretty strange. The vast majority of downvotes going around aren't even worth 0.05 SBD unless you have huge upvotes from SBI.

Agreed. What's all the fuss about 10% getting redistributed by a downvote? It's different if someone gets totally demonetized for weeks or months. I'm glad to have seen such accounts being healed.

SBI is like Steem Power used for self-upvoting with no possibility of powering down. That may be good for user retention. But for me personally that's a reason not to use UBI myself.