There are a lot of people here in germany who don't want to be tracked or at least want the freedom to decide. This kind of stuff really hits a nerve here and there was one of the longest threads I have seen sofar in the german gliding forum. There was a big outcry for an opt out option. Unfortunatly not all OGN operators feel there should be an opt out option. The problem seemed to be that OGN is an initiative of individuals. That means there is no central entity to discuss privacy requirements with or to enforce an opt out implementation. So basically it doesn't help that the solution might be technically trivial.

Tracking of individuals without consent also might touch strict german data privavcy laws - even though it would need a court ruling to clarify whether tracking a glider is already sufficiently linked to the piloting individual.

It seems that Flarm and also Butterfly Avionic (removing FlarmNet databases) took this topic quite seriously. In the end Flarm chose to end the discussion by taking the intiative. A new encryption should disable OGN short term and long term a Flarm organised solution will probably transfer OGN operators into Flarm control enforcing opt-out.