So is the out for wpengine that they aren't enforcing it across the board but using it to "extort" a dollar amount that they perceive that they are owed?
They really thing WordPress is something special. It really isn't; there are better systems. I think Matt is just mad because he is not getting any revenue from wpengine.
That being said, some commercial users of open-source software need to be better contributors to the eco-system and not just vampires.
aws ec2-instance-connect doesn't use docker, it just sets up a short lived ssh key in the instance metadata that you can use to connect. You can connect either via a public ipv4, ipv6, or a vpc private endpoint.