Apple sometimes offer a free 3 month or 1 year Apple TV+ subscription when you buy a new device (phone or computer). Here’s the catch, it’s only available once in your lifetime per family. I was on support with Apple today and they confirmed this. If one family member uses the free subscription, it doesn’t matter how many computers or phones you purchase. It’s literally a once in a lifetime offer!
We used our free trial 2 years ago, so my new MacBook Pro does not get a trial. So my tip would be don’t waste your free Apple TV on a 3 month trial. Wait until Apple have a 1 year trial. (It varies what they offer). Also, you have up to 3 months after purchasing a new computer to activate your free Apple TV trial.