https://mobile.twitter.com/matthew_d_green/status/1183391221861027841 Is this true? It doesn't say if it's just limited to users in Mainland China. This is very vague. Any Apple employees care to comment/clarify?
Someone disassembled the code. It’s limited to users with their locale set to China. Probably because the google version is blocked there.
The way GSB work: you download a local DB of partial URLs hashes (sha256). If there is a match, you send the full hash. It could be a hash of full URL, domain only, etc (32 combinations)
I need to look it up, biut you may only need to send the partial hash to get the corresponding full hashes