Why does AWS charge money on a free account?

Question

Amazon Web Services

$0.005 per Elastic IP address not attached to a running instance per hour (prorated) $1.33

This is in the expense item. Understood what kind of ip but! Do not understand why?
I only use 1 ip in EC2. I go to Elastic IPs and everything is right there 1 ip.
Is this allowed at the free level, or am I not understanding something?

Answer 1

Amazon is free exactly within the Free Usage Tier, everything above it is paid.
Unattached ip - above it.
https://aws.amazon.com/en/free/