I notice I can see some other Striders activities or not and does not seem related to being a friend or following them on Strava. Is it all based on privacy settings within Strava (or other ones) itself ?
Yeah, there’s an entire privacy section of the Settings page that lets you choose if/how you’re visible throughout the site.
Strava is the only service that imposes limitations on who you can show your data to through third party services.
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so if an activity is private in Strava it won’t show here for anybody else regardless? It’s just my “secondary/backup” CS account that is private in Strava so I don’t appear to be keep running with myself. I probably ought to delete that one here as am now “quite high” on the leaderboard and really “falsely”. It all depends when I take out 2 watches on 2 accounts which I now do all the time partly for “backup” if one “goes wrong” and might otherwise have to repeat a run 
It depends on the account settings - go check out that page and read through the description of each privacy level, that should clear things up.