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by a1a106ed5 1300 days ago
Whenever you see 0days reported by someone from Threat Analysis Group it means that Google (TAG is a team within google) used some advanced detection technique to discover someone, usually a nationstate, "in-the-wild" exploiting this.

Reading their blog gives insight on how they find these. For example, for CVE-2021-30869 they discovered on a "watering-hole" website (i.e. some group in china hacked a hong kong protesting website and hosted an 0day on it to exploit protestors' devices). I'm guessing Google has methods to scrape the entire web looking for these browser exploits