As analogs to the examples you give, advertisers could buy placement on Facebook during certain times of day, or on certain Pages. In those cases, demographic t

As analogs to the examples you give, advertisers could buy placement on Facebook during certain times of day, or on certain Pages. In those cases, demographic targeting is indirect but still effective. I have no insight or opinion on the ethical or legal considerations of targeting on demographic data directly, except to say that platforms should give you the option to conceal that data (and all data) from advertisers.