AWS cloud services you will use
EC2: miners and customer nodes
ECS: container deployment between EC2 devices.
VPC: network access to all resources in the cloud
Application load balancing: access to all resources in the cloud
Cost of using the template for 2 days: $ 4.85, estimated in one month: $75.6
I don't think in 2019 someone will leave 200K in a server exposed to the internet, perhaps it is a testnet server or a honeypot.
I'd suggest to use a firewall or similar tool if you want to expose RPC your node to the internet.
The geth/parity have some protection but its functionality is limited to block certain calls. If you want more advanced features ...