If I wanted to spread a message person to person on the street. I think I would find it odd if the government had a say in who I told the message to.
All this seems to be I'd a automated system of doing just that. So if I knew of a job at company X and I decided to tell my buddy John (cis gender male) but did not tell Jenny (cis grander female) would I be breaking any sort of rule? Or would I be forced to always find at lest one person of the opposite gender to also inform of the job?
In any case why do we care what Facebook is doing. They are simply a tool. U less you are suggesting that advertisers should not be able to do anything based off gender...