I don’t know why this obvious disinformation has a 95% upvote ratio, but it’s a specific fork made by a guy who presumably sells (mainly) to criminals and the police having found a backdoor into that fork. Has nothing to do with any smear campaign against the entire OS.
Check your facts people!
Let me just put it this way: the guys in the GrapheneOS thread over on tweakers.nl spent exactly four comments on it, including one laughing at how bad AD is, after which they proceeded to resume their discussion about their preferred banking app.