Why does AWS ECS have a limit of 10240 CPU units?

I have a script that uses 60 cores. So when I run it on a c518XLarge EC2, it uses most of the 72 cores (e.g. if I run top I see numbers around 90%). When I created a docker job on AWS ECS, it only used about 12%. Messing with the CPU limit didn’t help and only allowed a max of 10. Why is this limit imposed, what is its purpose, and how do I get around this?

Source: StackOverflow