I would not advise you to use the free VPS from Amazon. Firstly, it is very weak, and secondly, after a couple of months of free use, you will start receiving bills ... it's easier and better to rent the VPS from another provider for more adequate money.
You're right! To rent a free VPS from Amazon is a silly idea. As a result, you will pay more than for a normal VPS. I recommend to pay attention to the server which advises the developer of this ZOLD project. He will not advise the bad!
It will be necessary to check this server, from Amazon I heard often complaints about the prices and its work, but maybe people just could not use