Might not be under the OSA directly, but on security grounds certainly not a good idea to have live ATC on the net.
BALPA agree with this position.
There are losers out there who have thought it a giggle to talk to aircraft with their own transceivers; imagine if they could do it sitting in front of a PC with a live ATC feed.
And that's just considering mentally disturbed people, not someone, or some group, with malicious intent.
<<Shiver>>