CNBC articleIf you don't already pay for HBO through AT&T, HBO Max will also be free for people who pay for any of these AT&T services:
AT&T's Unlimited Elite wireless plan.
AT&T's Internet 1000 plan.
AT&T TV Premier (launching after HBO Max.)
DirecTV Premier.
U-verse U400, U450 and U450 Latino.
Note - Customers on other plans will be eligible for up to a free year of service.
For those who jumped on the 1Gbps Fiber plan for $49.99/month, this is a good free add-on
https://www.hbomax.com/faq/#howtogetFor some reason, this link
https://www.att.com/hbo-max/ does not show Home Internet 1000. But, on the main
https://www.att.com, the banner has a small link "See details" which shows the Internet 1000 being eligible. It appears the HBO Max page missed mentioning it.