There are more households sharing CP in your community than there are bus stops. (We can roughly map IPs of known CP files advertised over torrent networks.)
There are too few innovators in this space because specifics on CP networks are privy to law enforcement, and investigators are often patrol cops who get promoted into a child crimes unit.
It's fine (and true) to say these technologies are used for many more things than CP, but that's not an excuse to turn a blind eye to it, anymore than Craigslist does to child exploitation.