For me, this is a difficult issue to determine where exact lines should be drawn. It's a mixed bag for advertisers.
While illegal discrimination is one thing, targeted marketing based upon demographics not to discriminate against protected classes but to more effectively spend limited ad dollars is another.
Facebook's users cut across all sectors of society. However, advertisers advertise in certain publications or on certain media due to demographics. They choose particular TV shows and particular time slots for the same reason. Are all advertising platforms going to be forced to offer one-size-fits-all advertising info?
What would be the best demographic to target to market our product? Should we simply advertise in a blanket, non-targeted manner? If we were to do a mailer, wouldn't we choose zip codes (mentioned in the article) among other factors? Who's most likely to buy residential landlord coverage for 1-4 unit properties?
How could a religious publication target its religion if that category is no longer available?
Just how much granularity remains as to who's desiring to advertise and the categories offered?
Maybe the whole thing is simply a work in process and the news reporting isn't spelling out sufficient but known details to allay concerns.