> When traffic between clients and Load Balancers, or between Load Balancers and their targets, crosses Availability Zone, VPC, and Region boundaries, Amazon Elastic Compute Cloud (EC2) Data Transfer charges apply.

I shared this with my team, and one of them "well actually'ed" me about "ALBs with automatic zone load balancing do not charge additional data transfer fees for cross-AZ traffic" with a quote from aws.amazon.com/blogs/networ... (below):

Also, dark mode doesn't work well for presentations. Please use a while background

Yeah