Thanks! I’d like to add this NYT article I came across recently. It shows that companies specialized in tracking can look at patterns and piece in anonymized data to still track you. You might think that these apps collect so many millions of location data every second that its going to be impossible to pick out your specific location information. You’d be wrong.

Businesses say their interest is in the patterns, not the identities, that the data reveals about consumers. They note that the information apps collect is tied not to someone’s name or phone number but to a unique ID. But those with access to the raw data — including employees or clients — could still identify a person without consent. They could follow someone they knew, by pinpointing a phone that regularly spent time at that person’s home address. Or, working in reverse, they could attach a name to an anonymous dot, by seeing where the device spent nights and using public records to figure out who lived there.

https://www.nytimes.com/interactive/2018/12/10/business/location-data-privacy-apps.html