Rewarded Ad is an option that can be turned on or off on various Pickups and Blueprints.
If any of weapons or vehicles has rewarded ad option turned on then a player must watch an 20 seconds ad in order to receive their prize. Altough this function is ignored by an Elite players who doesn't need to watch any ads.
A small cinema clapboard icon will be visible above blueprint/pickup which has this option turned on.