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 month

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.