Maybe zero. There are those who will always find a way to put good technology to a bad use. Not that it's not a non-issue, it's not really a "quantum leap" as I believe there are enough safeguards built-in. And we don't really hear about other cheap tracking devices "stalking" victims.And how many go unreported and undiscovered? This is definitely not an "imaginary non-issue" as the previous poster suggested.
The Airtags are a quantum leap in terms of their stalking "features". There has never been a tracking device this cheap, small and capable available on the consumer market. Tile was close in theory, but they didn't have the critical mass to make their tags trackable almost everywhere like the Airtags are thanks to the "Find My network".