Re: ABC v Alphabet
I'd guess the reasoning is that Google don't technically need to know his identity unless and until a court decides that the content should be removed. So, if a court is willing/able to decide that all content which matches certain tests should be taken down based on private communication, there would be no need for claiming parties to risk Streisanding themselves in public court.
There is already some precedent for this, as Google voluntarily doesn't require people to go to court to get "revenge porn" de-listed, for example.
