Your free account can last longer than 3 years, and you do not need to re-register every year. The "10 million messages limit" refers to storage of the data. You cannot store more than 10 million messages on ThingSpeak with a free account. If you have one device and you send data to ThingSpeak at the maximum free update interval of 15 seconds, you will hit the 10 million messages after approximately 3 years. In this case, you will need to remove some of your stored data (download to your local drive for example). If you are sending data at a slower rate (once a minute or once an hour), it will take longer to reach the 10 million messages limit.
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