The late '90s-'00s solution was to blackhole address blocks associated with entire countries or continents. It was easily worth it for many US sites that weren'

The late '90s-'00s solution was to blackhole address blocks associated with entire countries or continents. It was easily worth it for many US sites that weren't super-huge to lose the the 0.1% of legitimate requests they'd get from, say, China or Thailand or Russia, to cut the speed their logs scrolled at by 99%. The state of the art isn't much better today, it seems. Similar outcome with more steps.