If your automatic detection is tuned well enough not to produce shittons of false positives, you should have enough people to review suspected cases. Real positives ought to be escalated to actual police.
(Also, actual police will not be happy about an automatic mechanism that locks out real CP producers out of their mailboxes, thus alerting them to the fact that there is something going on, and possibly giving them time and opportunity to destroy some incriminating evidence. There is a reason why suspected criminals are staked out carefully, then suddenly raided.)
Which will either clear or implicate the person involved, but either way cannot be done robotically.
Nothing. The programmer tried to open a lawsuit to gain back his rights but he couldn't afford a decade lawsuit against a mega corp.
So the programmer remains banned today, for Google's mistakes.
Google won't admit wrongdoing, because it reveals how flawed their system is and opens them to cases.
Should such an entity with no responsibility be allowed so much power over our lives?