Reminds me about the telco offer to sell gps location traces on anyone you wanted, but to ensure 'anonymity' you had to order a batch of 30 people minimum and y

Reminds me about the telco offer to sell gps location traces on anyone you wanted, but to ensure 'anonymity' you had to order a batch of 30 people minimum and you did not get information on which trace belongen to who in that set. Figuring out which of those traces belonged to which employee was a real puzzle /s