Neat but I read the site literally every day and have posted for years and don’t have the ability to downvote. Perhaps I’m on a blacklist of ex-slashdotters.

There’s a karma requirement. If I recall correctly I gained the downvote when I passed 500, but I could be wrong of course. My impression of this site is that they don’t do blacklists, they’d probably warn you straight up if they had a problem.