Normally I'd guess the former given Google's legendary propensity for getting rid of services, but a couple months ago Amazon did something similar [1] which makes me wonder if the two are connected somehow:
> Effective September 4, 2023, Amazon is no longer selling print and Kindle, magazine and newspaper subscriptions.
...
> Will I receive the remaining issues for my current Kindle subscription(s)?
> No, you will no longer receive issues of your Kindle subscription(s) after September 4, 2023. We will issue you a pro-rated refund for any undelivered issues within 3-5 business days. Visit the Your Memberships and Subscriptions page for more information.
> Will I receive the remaining issues for my current Print subscription(s)?
> Yes, you will receive all issues of your print subscription through the expiration date. Please visit Your Memberships and Subscriptions page to determine when your Print subscription expires.
Kindle issues you have already received remain available on your account for download.