It's crazy that it's so common, but that they wouldn't make that obvious.

Considering the whole IPv4 extinction that's coming down and all.

So an elastic IP is just an AWS provided IP that they hand over to you... it's free while your instance is running but if you stop your instance, you get a small bill (it's like $0.84 a month)

I will gladly welcome the eventual IPv4 extinction, but unfortunately I'm pretty confident it won't happen for another 30 years.

I don't have any elastic IPs. The only thing under EC2 is a security group that it won't let me delete, but seems like no resources. My bill this month is $2.88 /shrug

Check volumes, non-root volumes are kept on deletion but should be EBS charged instead.