Sometimes they are.
Someone calling himself Duncan Hayes posted the following message in a Botswana-based Facebook group called "Second Hand CAR sales Gabz". His original post was selling the "Motor Club of America" and claimed that recruits could earn "$500-$1600+ on a weekly basis".
When various members of the group, myself included, suggested that this was a) not relevant to us in Botswana and b) a scam, he became utterly unhinged.
Warning: Don't scroll down if you can't take some rude words.
Our friend Duncan does seem to have certain pre-occupations, don't you think?