I don't know exactly where the number of users down voting would be to involve the penalty, but it probably needs to be based on a number of users each over a certain amount. Perhaps it's best for most people to not even know those limits. But it needs to be enough where it would be prohibitive for one person to make multiple accounts to envoke the penalty by itself.

However, I think it would be a useful mechanism to prevent abuse/scammers like that Cowboy who was begging for sats on Thanksgiving and then accidentally posted for a second account and got caught. If enough people downzap then they get less and less sats as a percentage since they'd be sent to rewards pool instead for a period of time. They'd still be able to post/comment, even if it's more expensive, so you aren't censoring but collectively you are sending a signal that their presence isn't currently appreciated. Currently there is nothing like that and this you get people just posting question after question and tons of posts to farm zaps.