Discrimination based on age, gender, race, ethnicity, language, even culture a good thing.
In Canada discrimination in hiring is a requirement of our Employment Equity laws.
IMO the most obvious examples are jobs open to Indigenous people people only but anyone looking for work knows to target those business that might actually hire them. An "Indocanadian" business saying they are looking for "Employment groups: Indigenous people, Newcomers to Canada Youth" (quote from todays advertisement) are trying to make it clear that those from other groups need not apply. In that case a look at the shop floor and the over-representation of certain groups would make it clear to those from other groups.
After a while the jobless learn where to direct their efforts. (BTW: less than a million Canadians are Indigenous and only a few are looking for work outside of certain areas, so it is always safe to target them even if someone from another group is the only real target)
As a result, in Canada, it is a very valid point that surveillance, monitoring, and tracking of individuals online is a good thing because it enables targeted discrimination in job ads and hiring. It also helps those Canadians looking for work and being discriminated against from having to face that reality with every other email. Even more so after EI runs out because they don't live in a certain part of Canada.
and yes I have been directly involved in hiring for a major Canadian company, that might be evident to those familiar with our programs but I'll mention it because I know there will be Canadians claiming there is no such discrimination in Canada, and some will believe that.