There was a second spam wave in October of 2019, so the ban was added back again. We can disable it again or we can try to make it smarter since these waves seems to happen more than once. I looked at the entry and this is what I'm seeing - the [\uAC00-\uD7AD]+ is part of the unicode range for Hangul.
![Screenshot of SEDE query results listing the date the block was put in, the text of the block "[\uAC00-\uD7AD]+" (a subset of Hangul characters) and the date it was last hit (2020-09-01 and the number of hits -226.](https://i.sstatic.net/2hFRh.png)
Over the last 11 months there have been a bit over 300 hits on the block -
Based on this, it doesn't seem like there's a ton of attempts happening currently, so it's probably fine to drop it again. Confirm if this is what y'all would like and I'll get a dev to remove the block. If you have other thoughts, let me know.
I'll check back in a week unless someone pings me that it's more urgent and decided.