Yeah, the targetting isn't that difficult, I guess. If you know crown prince Akeem Joffer was in New York 5 days ago, and is in Paris 3 days ago, you can probably diligently query Strava users who weren't in New York for a long time but showed up 5 days ago, and see if they showed up in Paris 3 days ago, and boom, you've found a member of his entourage.
Even if they use the anonymizing feature that masks their start/end points, if you find a few other members, you could be able to triangulate a big hotel near them and guess that that's where the crown prince stayed... and the next time you hear he's coming to NY/Paris, you have this information.
Even if they use the anonymizing feature that masks their start/end points, if you find a few other members, you could be able to triangulate a big hotel near them and guess that that's where the crown prince stayed... and the next time you hear he's coming to NY/Paris, you have this information.