30 days of the paid Gemini tier at no cost, offered as a trial to Gmail accounts that have never bought a Google subscription.
The offer appears as a free trial on the Google One plans page. It is shown only to eligible accounts, and the person who shared it says it appeared on two separate Gmail accounts.
The catch: a card is required, the trial shows only for accounts with no prior Google subscription purchase, and it renews at the paid price unless cancelled.
How to claim: 1) Sign in with a fresh Gmail account → 2) Open the Google One plans page and confirm the free trial is offered → 3) Add a card and subscribe, then cancel before the month ends if you do not want to pay.
Link: Google One plans