I understand why people will put a tracker on their keychain -- and in a day and age where most people are content to let their cell phone and tablet apps track their movements daily, adding a Tile system on top of that probably doesn't seem like a big deal to a lot of folks, but if you have any personal security concerns it ends up being a really bad move.
Most companies that do this sort of tracking -- you're the product, not the customer. There are rules that they have to follow to anonymize data, to protect you, and they will tout them all day long. If they have a record of where your cell phone connected from on a map throughout the course of the day, the thinking goes, that data has to be anonymized. You can't be identified as John Smith of 123 Hometown Road, you'll have some alphanumeric identifier, and that way they say, people can research on how to improve services, without invading your privacy, right?
Well, the PROBLEM is that when your phone maintains anonymized data on your movements, and your Tile setups maintain anonymized data, and your car GPS maintains anonymized data, and your tablet and laptop and anything you have locations services enabled on , are maintaining anonymized data, people who have research access to more than one of these streams can start tracking data from two or more of these sources and overlay them on one another to look for similarities.
It's kind of like the old two-variable algebra problems, where you can only solve them if you have two or more equations to work with like x + 3y = 17 and 3x - y = 31.
Long story short, if a company that's accessing this information and building profiles on users sees an anonymous GPS and an anonymous cell phone record and an anonymous Tile record and when they lay them on a map they all overlay one another, you can easily see who is who. You might not have been able to tell who was using cell phone A, but by the time you've found their GPS and seen that both location trackers match up and that they go to Bank B's ATM, Restaurant C for lunch, Grocery Store D and Liquor Store E on the way home, if you have access to those systems the chances are good that hitting up those systems and comparing anything you can pull from them will let you triangulate upon the name, sex, address, occupation and all manner of other facts about them. The one that ends up being the goldmine are the little 'rewards' cards that most grocery stores want you to use when you shop with them. Y'all would be flat out astonished at what you can discover about a person by studying what they buy at a grocery store.
Indeed if you don't practice information hygiene ( and if you don't know what it is, you don't practice it) most trackers working with anonymized data sources probably already have a file with your name on it. And they know things about you that you wouldn't be happy to know about. No one's going to go look you up if you're buying a pack of gum, but if they want to sell you a $30k car or a $250k home, buying a file on you and getting into your head might pay off, and a political operative looking to shore up support for their candidate will know what they can say that you're likely to resonate with, so campaigns keep as deep of files as the law allows them.
Food for thought. All I know is if I do one of these, it won't have a tracker in it.