Thanks for bringing this to our attention!
Back in January 2014, Salesforce was hit by an influx of Russian Spam. The same day the meta post was created, we added Cyrillic characters to the blacklist on the Salesforce site to block that spam.
I'm guessing this was intended to be a temporary block as our spam responses are generally designed to make spamming difficult until the spammers move on to somewhere else. In the time since the blacklist was established, it blocked something just shy of 2000 attempts. That's about one per day and probably a handful of those have been people testing it today alone.
Based on that, I'm guessing that we can remove the blacklist and see if the spam picks up again. I'll dig into the data a bit more to see who's hitting the blacklist to double check and then will likely recommend removing it.
I'll see if we can get this fixed next week.
Some additional data I pulled:
Y'all did used to have a big issue and there was a smaller attempt at posting in Cyrillic in 2017 but, for the last two years or so, it's been about 15-25 attempts per month
Of these events, 175 were attempts to ask a question and 50 were attempts to post an answer. The most frequent reason to hit the blacklist were attempts to edit - 2195 edit attempts, most of which happened on five posts which attracted 660, 593, 492, 203 and 105 edits each.
Additionally, only 58 attempts have ever been in a comment - all time - on 20 total posts. Six of which were related to this specific event and on another post, someone attempted to leave a comment 15 times.
Some things have changed since y'all had this blacklist in place - we have the community group, Charcoal, and their bot, Smoke Detector, scanning for and removing spam. So, considering the above, do you think the complete blacklist - or any - is necessary? I'm leaning towards get rid of it all and if there's a huge resurgence, we can re-establish part of it but in a way that doesn't overly-block this content.
Adam was kind enough to remove this block so Cyrillic characters are now allowed. Please let me know if y'all run into issues!