Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I received a refurbished iPhone X from AT&T's insurance program and got Apple TV + free for 1 year. All we did was activate it as you normally would and the next day I received the notification.
 
I bought a 2018 Mac Mini on ebay this week. Registered it with my ID etc. Couple days later I had an email stating that I have Apple TV+ free for a year
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.