I’d just install UFW and either set the default for incoming and outgoing to deny and unblock the game ports manually, or just set incoming to deny and outgoing to allow.
You could pair that with OpenSnitch to see all attempted incoming and outgoing connections and block them by default, and then just allow the ones you want as they happen.
No one is pretending anything, and no one is claiming these laws aren’t specifically targeting trans people, of course they are. What they are claiming is that the same law would apply to what is being depicted in the photo, which is true.