Yes, they are usability issues, if I can't trust the software and need to evaluate every step it makes, because it might do something against my interests. That

Yes, they are usability issues, if I can't trust the software and need to evaluate every step it makes, because it might do something against my interests. That's quite the cognitive overload. I'm not saying that it's strictly worse or the same as with FOSS software. Just a different tradeoff.