Hi,

I can't find any reference to that either on the FLARM
website or in the forums.

It's in the manual:

Until further notice FLARM may not be used in the USA
or Canada without written authority of FLARM Technology,
or in an aircraft that is registered and/or insured in
the USA or Canada. Likewise, operation of FLARM is
forbidden in aircraft in which one or more of the occupants
resides in or is a citizen of the USA or Canada. Likewise,
use of FLARM is forbidden if the aircraft concerned takes
off from, makes an intermediate or final landing in the
USA or Canada.

The phrasing makes it quite clear to me that fear of litigation is the reason
for it.

Ciao, MM
--
Marian Aldenhövel, Rosenhain 23, 53123 Bonn
http://www.marian-aldenhoevel.de
"Success is the happy feeling you get between the time you
do something and the time you tell a woman what you did."