If you own either an Xbox One or an Xbox Series X/S, you can play any of the free online multiplayer games without an Xbox Live Gold membership, meaning that over 50 free-to-play titles are available to all users, regardless of subscription.
These titles are nothing to be sneezed at either: Fortnite, Call Of Duty: Warzone, and Destiny 2 are but three of the newly-free available titles. Party Chat is also available to all users.
Free-to-play now means free-to-play.
— Xbox (@Xbox) April 21, 2021
This appears to be a response to the angry reaction after the company announced plans to double the cost of Xbox Live Gold subs in January, a decision they immediately backflipped on.