who understands this stuff?
 

To 'follow their petty rules' just means 'initiate the file transfer from
the other end'. Would you prefer they packet filtered TCP SYN inbound to
enforce their AUP? Of course that is ridiculous, now, isn't it. And they
recognize this, so they dont (and because it breaks legitimate services
where connections are to be accepted to the @home end after some
authentication process has been completed).