Few points from Ostrow WGC.

1) OGN network was quite spotty, I doubt that "ground controllers" were of any use. Most of the gliders were in sight in large gaggles, no need to flarm radar. Letting polish or french teams to start 3 minutes before and then catch them with flarm, you are out of luck. They are that good.

2) Kawa flew either flarm off or in stealth mode (and got warning for not being visible on tracking). No one leeched him by using flarm.