Would you care to make a more detailed argument or proposal? I'm willing, in general, to be persuaded by a good argument, but you'll have to show your work. :)
If roofing job advertisers are forced to spend half of their budget on a demographic that objectively clicks through at a drastically lower rate, they will have to spend 2X more money to reach the same number of workers that they used to reach.
Making advertising those jobs on Facebook 2X more expensive is an incentive for those firms to revert to alternative hiring habits that are even more nepotistic, reducing overall access to employment.
> spend half of their budget on a demographic objectively clicks through at a drastically lower rate, they will have to spend 2X more money
This reasoning pre-supposes that only CPM-style ads are available, to the exclusion of CPC or CPA, but that seems unlikely on a platform as modern as FB.
Don't regulate job ads targeting at all, so that it's as cheap as possible to post a job ad and so that there are no burdens on websites that host job listings.
That's a conclusion, not a justification. The very topic we are discussing is that ignoring regulation causes some classes of people to be excluded entirely from some job postings. You are arguing the opposite, which is fine - but you can't just claim that it's self evident.
Making advertising those jobs on Facebook 2X more expensive is an incentive for those firms to revert to alternative hiring habits that are even more nepotistic, reducing overall access to employment.