Some free tier quotas only last 12 months, others are indefinite. From the first paragraph of the linked article, they are removing the 12mo limit on the monthly free bandwidth allowance:

> Free data transfer out of CloudFront is no longer limited to the first 12 months. [..,] Free data transfer out from AWS Regions is also no longer limited to the first 12 months.

In this case it’s 1tb free every year. They didn’t put the 12 months stipulation on it.

Not entirely, certain services are free forever and this reduction is one of them.