it might have been law enforcement. they might be using this to track potential drunk drivers (i am not saying you were drunk driving or anything) but i do know there was a few articles on it this year, here is one i found

https://www.macrumors.com/2021/07/19/police-find-unexpected-...

or it could be worse and you could have a unhinged stalker on your hands. both are intrusive.

but it’s hard to say, is there a way to find out the owner or look at log files to see what op or which provider is accessing the location details of a tag? i know about these tags but i’ve never used one before so understanding is fairly fresh