This is so nasty in multiple levels, not only targeting (ok, Facebook prefers the verb 'connecting') possibly desperate people with false medical promises but a

This is so nasty in multiple levels, not only targeting (ok, Facebook prefers the verb 'connecting') possibly desperate people with false medical promises but also the fact that if a user clicks on the ad, the receiving website now for sure knows of your medical condition and can do as they please with that info.