[fsavard]

There was an episode of the american version of the "modern Sherlock Holmes" TV series, "Elementary", where the plot revolved around a company akin to Uber (called Zooss in the show). It was particularly illustrative of how tempting it can be for internal employees to abuse that type of data. Among other things Sherlock was able to requisition a large fraction of the company GPS tracking data for his murder investigation. As a side effect he was able to figure out who was having an affair, who was going for an interview at a competitor's company, etc.

5 minutes after drop-off is quite enough to uncover where you meant to _really_ go if you gave a close-by address, in these scenarios.

That's pretty much what the OP meant with "So your secret rendezvous may not be so secret" but it's particularly poignant in a TV show.