They have a usage fee, which is how much they charge per hour you are using one of their instances.
The poll is about adding a percentage to that fee. Since it is a percentage, it can be applied to any type of EC2 instance since they all list a usage fee.
Same as Amazon
If you look at Amazon's EC2 pricing page:
http://aws.amazon.com/ec2/#pricing
They have a usage fee, which is how much they charge per hour you are using one of their instances.
The poll is about adding a percentage to that fee. Since it is a percentage, it can be applied to any type of EC2 instance since they all list a usage fee.