Most likely targeted, and possibly with different free point amount. I received the offer for 20,000 points.
Upon launching the Telstra app, you'd see a banner for "Get 20,000 Telstra Plus bonus points on us!". Click on Activate offer.
I got the points within 24 hours of activating the offer in my account.
Edit:
As reported from several users below, it appears these are targeted mainly to Silver and Gold Status tier, i.e. people who have $1500+ spend per year through a single Telstra account.
No banner at all :(