Here's a 'real world' analogy:
You go into a bike shop for the first time. You don't know anybody there. When they are getting the invoice ready, they ask for your phone number.
As soon as you give it to them, they start reciting a list of your friends from the past 20 years, and showing you their pictures.
Would that be 'normal'? 'welcome'?
I wouldn't be comfortable in a place where my name and address was displayed on a large roadside screen if I crossed against the amber light, but that happens, too.....
Anyway, I didn't think Strava advertised itself as a 'social media' site.
Would folks here be happy if BikeForum harvested their email contacts (and sold them)?