these aren't servers.

these are PaaS.

if you want a cheap server with no extra services or support, there are cheaper things, like EC2 Micro instances, Linode, Slicehost, Rackspace, and a million other VPS providers.

Apples to Oranges.

If you can't spend $100/month on a server use App Engine, a free Heroku Dyno, an EC2 micro instance, or any number of other cheap virtualized hosting companies.

But not everyone needs 2G of ram? No reason why a $20 linode can't suffice if you don't need to spend $100/mo yet