for analog and HDzero systems, the drone only transmits and the goggles/receiver only lessens. you can have any number of ppl watching you video feed of on analog or HDzero drone with no ill effects. as long as you not doing something you don't what other people to see. you can very easily watch your buddy fly you just need to know or scan the channels until you find the one he is using
digital systems like DJI, walksnail, P1, transmit data packets from the drone to the goggles/VTX and the goggles need to talk to the drone to say i revived the packet send the next one. this is what make sharing the live feed a PITA, since you cant pair more then one goggle/receiver at a time. you can still share the live feed its still a PITA the easiest way would be to use the HDMI out from the goggles to a portable monitor. this is what i do with my walksnail goggles x. some goggles do have a wifi stream from the goggles i recommend avoiding this the video is very laggy, unreliable, short range connection and its adding RF interference