Although I understand what this article is trying to do I find it slightly misleading saying things such as “1 GB RAM 10 $/month”. I understand that is a median cost, but a median cost can be very skewed as you pass the “bang for your buck” sweet spot.
Using the AWS calculator I got that an ec2 instance with 2 vCPU, 1 GB of RAM and a 30GB SSD would cost around 9.86 USD. Which is less than the median for just the ram itself. Of course the same would apply on costlier VMs making 1Gb of ram for 10 USD look like a bargain but I just personally don’t like the approach.