I banned an entire country once -- not the best way to go but after all other mitigations failed it was the last choice available. And it wasn't China or Russi

I banned an entire country once -- not the best way to go but after all other mitigations failed it was the last choice available. And it wasn't China or Russia. It's almost impossible to give everyone the same number of bytes of work with -- if you can solve that problem you've solved it all.