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> China only.

Based on the twitter conversation, it's NOT China only. It's Chinese localization only. Big difference. That means anyone anywhere in the world who set their computer to Chinese has their data sent. Including Europe which is likely a GDPR violation.

The google servers apparently takes url hash prefix. Does tencent do the same? If so is it still considered a gdpr violation? There is not much info in a url hash prefix.

Suppose peeps going to HN are suspect. Then anyone who often produces hash prefixes that match HN is suspect. When you start getting sequences, you could possible start matching how people navigate a website.

Essentially, a hash-prefix allows you to rule out / semi confirm guesses about browsing behavior.

Looks like the twitter post you referenced was deleted. That user's only recent post is about super mario maker 2...

I'm getting a "Page doesn't exist" for your link FYI.

More details on how this works, for Google at least, here:

https://developers.google.com/safe-browsing/v4/update-api#ch...

This is only one of the APIs. Full doc at:

https://developers.google.com/safe-browsing/v4

I am getting a "Sorry, that page doesn’t exist!" for the twitter link you shared.