> compared to the "hard" ones you get if you're on tor (or otherwise "shady" network)[.]
In my (limited) experience they serve you "hard" ones, and then continue serving you "hard" ones until you give up and go do something else.
In my (limited) experience they serve you "hard" ones, and then continue serving you "hard" ones until you give up and go do something else.
All they have to do is give out impossible captcha's.