Bynaus is not a Federation member and this was explicitly stated in SCE: Belly of the Beast
. The exposition when introducing the Bynars stated that while they were not Federation members they had agreed to abide by the rules and regulations therein for the duration of their stay on the da Vinci
and there was also no mention of them being Federation members in "11001001" otherwise there would have been no need for them to steal a Federation starship, they would have probably had a Galaxy
-class of their own.