I can't reply to your other comment (karma)
You don't care about how much time your requests cost me? Nice to know.
Here's what your wrote, first line of this post:
I've gotten sufficient evidence from support that voiceofra has been doing retributive downvoting. I've banned them without prior notice because I'm not giving them more chances to downvote.
If you have sufficient evidence, why can't you publish it?
I said over 800 downvotes to three people. This is what support emailed to me. I could copy and paste some support emails with more detail, but I don't know whether you'd trust me, and I don't know whether I'm being invited into an extended discussion which will be utterly pointless.
There's some elements of won't rather than can't. I'm not fond of complying with rude demands.
I've gotten sufficient evidence from support that voiceofra has been doing retributive downvoting. I've banned them without prior notice because I'm not giving them more chances to downvote.
I'm thinking of something like not letting anyone give more than 5 downvotes/week for content which is more than a month old. The numbers and the time period are tentative-- this isn't my ideal rule. This is probably technically possible. However, my impression is that highly specific rules like that are an invitation to gaming the rules.
I would rather just make spiteful down-voting impossible (or maybe make it expensive) rather than trying to find out who's doing it. Admittedly, putting up barriers to downvoting for past comments doesn't solve the problem of people who down-vote everything, but at least people who downvote current material are easier to notice.
Any thoughts about technical solutions to excessive down-voting of past material?