[clairity]

time spent doesn't work because it's only loosely correlated to the actual behavior they're trying to track, which is to read the tos. reading is not even perfectly correlated with understanding the tos, which is what we're really after.

this type of mistaken logic (loose correlations taken as tight ones) is everywhere. it's so common to look for secondary characteristics that can stand in for the desired one. and that's often how we get unintended consequences.