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1. Genetic nondiscrimination laws are under constant attack (GINA, the most comprehensive, faced significant weakening this Congressional session - fortunately, it appears to be on the back burner for now). That's in the US. Canada has significantly less genetic privacy legislation, and the Trudeau government is negatively disposed to that which currently exists.

2. There is no such thing as anonymous genetic data once you move past extremely small SNP panels. Even if the data is pooled.

Then how did they identify a murderer from the dna submitted from a cousin/relative?

You're thinking of the Golden State Killer and GEDmatch.

Although both 23andme and GEDmatch match up relatives, I don't think they share your actual genetic sequence with your matches. 23andme's research and data publications are anonymized.

the user had uploaded their exported 23andme (or similar) data to GEDmatch on their own volition.

Health insurance discrimination using genetics illegal (GINA), but life insurance and long-term care insurance is not.

How do you anonymize an individual's DNA dataset (600k-900k DNA markers)?