[verall]

A lot of scams unfortunately operate right on the line of legality like the car warranty morons

[cj]

Sure, but that's okay because you don't need 100% of spam calls to be recognized as spam for the incentive to do its job. The system still sounds like it could still work even if a large percent of calls weren't flagged.

[orbital-decay]

This works both ways, if the detection rate is low then nobody would press a "lose $10" button.