They’re using a classifier to capture metadata (like “does a dog live there?” or “does a baby live there”) by categorizing sounds. That’s all technically legal, that’s why they do it that way.

Why do you care about the opinions of people who can’t even fathom that someone might use Alt-hyphen to get an en dash (or shift-Alt-hyphen for an em dash)

And that’s on Mac. Obviously on Linux there are even more options. (Compose key and so on)

CO2 makes you panic, that would be horrific.