> It's extremely risky to put out a mass update, yes. But if it were a targeted attack against an individual, the risk is greatly reduced, especially if that individual won't think twice about it.

At that point, you'd have to hope the target would not check the hashes of update files. If detected, then there is the same issue: A signed malicious update being detected (and easily verified cryptographically if given to a reporter) would cause a catastrophic media firestorm, eroding trust in the vendor forever.

> With that said, you do have individual targets that are suspicious (e.g. https://citizenlab.org/2016/08/million-dollar-dissident-ipho...). There's always risk.

0-day use against perceived "high value targets" is indeed a possibility and valid concern. No argument at all there.