I think what the comment meant was Facebook was trying to "steal all your (online) activities on phone irrespective of app to do big data analytics. "

This would have been trivial via the Free Basics program because Facebook would have been the gatekeeper for all the online activities. No deep packet inspection necessary. Just have the users agree to having all their interactions with those carefully selected 'partners' allowed to be used by FB ...for you know, providing better service and improving content.

At one point at least, internet.org wasn't supporting HTTPS (see https://nakedsecurity.sophos.com/2015/05/05/facebook-opens-u...).

Doesn't prove anything, but not supporting tls makes me think they want to inspect the traffic.