Right. I've been OK with some international followers. I've ridden with a couple of them, then their friends follow me too. I have some friends that have moved around the US and world too. So I have some real-world friends in Japan, UK, Norway, ... But the Brazil crowd, I don't know any of them outside Strava-land.

Anybody actually tracking rides in Strava is less worrisome, I guess somebody could hack that and upload fake rides, but I'm not that worried about people posting activities. I will block any user that has no activities - that's a big red flag to me.