Japanese cops deliver warnings in replies to crime-linked social media messages
japantimes.co.jp
japantimes.co.jp
As is almost always the case - the road to hell is paved with good intentions & mutters something, something slippery slope towards automated censorship.
And as always it's "think of the children" or another one of the boogie-man "reasons".
I have an almost Pavlovian response to be against any initiative that uses those dog-whistles.