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medium.com
medium.com
1) From another app, which obviously this author didn't do 2) Tapping the "+" icon on the top corner with a date in the calendar below highlighted. The New Event screen comes up with the highlighted date automatically filled in the Starts and Ends fields. This seems the most likely method if they were manually entering an appointment.
The point is, there is not enough detail to suggest that Apple listens to phone calls when there are other more plausible methods (and certainly more testable) that Siri could have used to obtain the information.
Creepy is the new cool. If it wasn't you'd do something about it like put your iThing in the recycling.
The "no alternative" argument is never a good one. We call it "Bad Faith" in philosophy.
There is always an alternative.
Existentialist Jean-Paul Sartre put it roughly as:
Even when you are on your knees with a gun to head, you still have a choice. You can choose to die.
Few people today have the courage to embrace such a tough philosophy, but not understanding at least the principle subtracts so much from your life. Total inauthenticity means living as a shadow, "pretending to be yourself" (some pale "acceptable" version of yourself).
This article is better than the dry Wikipedia one in my opinion [1].
[1] https://www.psychologytoday.com/us/blog/hide-and-seek/201203...