So we have a situation on Travel.
I assure you, none of these are legit. This has been going on for weeks, at something like this volume at the same time every night, consistently. The normal IP-based blocking isn't working for these people.
At one point, Stack Exchange simply blocked all CJK (Chinese/Japanese/Korean) characters on Travel... until someone complained about not being able to write CJK characters in legit posts.
But this spam is almost completely CJK characters - easily 80-90%. I can't think of, and haven't seen, a legit Travel post with that high a percentage of these characters.
So, a solution: Block posts with >x% (probably 70-80, 90 if conservative) CJK characters. I'm not sure if the platform has this functionality yet... but it should.
So, if we do have this functionality, let's use it. Otherwise, can it be developed?