Had another player to test tonight and it seems it is not "per farm", i am seeing his worker and hearing the radio chatter for his workers.
Confirmed that we are not 'contractors' to one another.
ahhh. that is not good. i had someone testing this with a group on g-portal.com and he said they were isolated and worked fine.
i will work on isolation for the GUI readout first, as you should not be seeing them. hearing them... that might be a "we are all on channel 19 talking" thing for now... where everyone can hear what is going on server-wide.