How can I turn off internet access for Mac apps
The firewall settings you have tried to configure apply to incoming connections only - this is why it is not working for you.
Basically a program on your computer can initiate a connection to an external computer, which is known as an &quot;outgoing connection&quot;.
Similarly a program on an external computer can initiate a connection to a program on your computer, which is known as an &quot;incoming connection&quot;.
In both cases, data can flow both ways as soon as the connection is established. That is a program can initiate an &quot;outgoing connection&quot;, and receive lots of data on that &quot;outgoing&quot; connection.
In order to do what you want, you'll want to install a program such as Little Snitch, which can block network connections from programs such as Origin.