Have you ever flagged anyone for say "running" a mile in 5:30 minutes gor crown after crown for the segments, when in reality they were on a bike while their partner was running? All they had to do was log it as a cycling activity, but they used the the title "Bike ride while x ran" with run as the activity.
On the one hand I'm not too bothered as it doesn't take away anything I do, but on the other, I am a little competitive and like collecting crowns or cups for being in the top 10. It also means, it's unfair for anyone who genuinely ran the fastest for that segment who loses out to a cyclist.