Unfortunately the anti-stalking features have made Airtag mostly useless for theft prevention. You have less than an hour to retrieve your item before the tag alerts the thief they are being tracked. I've seen it trigger as quickly as 30 minutes.
While this is true, Airtags are not designed for theft prevention, and never have been. They're designed to locate lost items.
Apple should be applauded for making the only tracking tags with literally any kind of anti-stalking features at all.