AWS doesn't decide or even care about this, customers configure security group rules for their own services. Nothing is allowed by default, so if you want ICMP

AWS doesn't decide or even care about this, customers configure security group rules for their own services. Nothing is allowed by default, so if you want ICMP you would need to allow it, most font bother because it's not that helpful in a cloud environment (can just monitor the TCP port instead and get similar information).