Safety should be the main aim not commercial gains.
For once I am not going to turn this into a humourous retort., this is an important point.
FLARM is a cash cow cloaked in a shroud of safety.
I urge you to go and read the thread for the petition posted by Steve.
In nearly 30 years of engineering, I have worked for companies who have strived for open standards to allow co-optition (co-operation, competition). Successful closed systems tend to innovate at first, but end up with receding architectures and poor improvements to their technology from the contemporary leading edge.
When you start to protect your technology and IP by building barriers to entry, rather than improving your technology, something has gone wrong.
I honestly do not see flarm changing their strategy anytime soon.
Their policy seems to be to try to muddy the waters, the responses from flarm on the petition are not encouraging.
We could decrypt their streams, but if they chose to change their encryption, it is all broken again, could you imagine a scenario where vodafone wants to interact with O2, but O2 kept changing their operating frequency