That is hardly true. Case in point - my wife put down her keys at a store and managed to leave without noticing (this was early after AirTags hit the market). I was driving and we left without recognizing that a few hundred dollars of keys had been lost.
Later that day, we noticed. She called a few stores all said there were no keys found. We then tracked the AirTag - and in fact, it was at the store. We returned and were able to locate it, at one of the registers in a lost and found. We never would have found that it not for the AirTag.
Since then, we’ve used them to not leave things behind, to find things lost at home and elsewhere. There are indeed many legitimate uses despite your want to claim otherwise.