It's back again, at least in the US.
Get 2 months of Kindle Unlimited for free, offer valid until 3/31/2021.
Terms and Conditions
Spoiler:
Limited time offer. Amazon reserves the right to modify or cancel the offer at any time.
Offer must be redeemed by 11:59 pm (Pacific Time) on March 31, 2021.
Link valid for one-time use only.
Limit 1 redemption of offer per Amazon customer account. Offer may not be resold.
Offer is only available to new to Kindle Unlimited customers that are United States residents.
Use of Kindle Unlimited is subject to the Kindle Unlimited Terms of Use.
After the trial period, you authorize us to charge your credit card on file or another available payment method $9.99/month plus any applicable taxes until you cancel. You may cancel your subscription at any time by visiting
www.amazon.com/kucentral and adjusting your settings.
If you cancel your Kindle Unlimited subscription during the free trial period, a refund will not be issued.
If you violate any of these terms, the offer will be invalid.