However, if I leave my bag on a train then the fact that I am no longer there means that at some point the other passengers may get a warning and potentially someone could disable it, thereby negating the use of the tag.
There are lots of ways that someone could disable the tag, but hopefully most people won't panic and do so unless they think they're actually being stalked.
For instance, if I find somebody's bag on a train with an AirTag on it, I'm more likely to scan it and figure out who it belongs to (although as Apple explained in a recent
Fast Company interview, you can only do that if it's been placed in "Lost Mode"). However, there's also the fact that many people will do exactly what they'd do if they found a bag
without an AirTag, which is to either leave it alone or turn it in to a lost and found somewhere.
Granted, there are some folks who might panic when receiving one of these alerts, but they're not "stalker alerts" —they're presented in a fairly benign way, simply advising someone that an AirTag has been found moving with them, and leaving people to draw their own conclusions as to what that means.
These alerts also only appear on iPhones running iOS 14.5 or later, so that will rule out at least a few less tech-savvy folks 😂
I speculated yesterday that there could be the possibility of the system being a bit more clever about this. For example, if the tag is being picked up by a dozen people then it is more likely that a scenario like this has happened, compared to just one person. The fact that these people are all on a train line is another clue.
Interesting idea. The key to the notification is also that the tag has to be "travelling with you," and so far Apple hasn't really said how far it has to go before that kicks in, or even how close it has to be. If you leave your bag behind on a train or bus, people are going to be getting on and off throughout the trip, and there's a good chance the range is such that not everybody on the vehicle will be close enough to be recognized.
In fact, I wouldn't be surprised if the proximity range for this alert is fairly tight, since it's solely intended to be an anti-stalking warning. It's highly unlikely that any AirTag more than a car-length away from someone is being used for stalking purposes.