It's not just companies, mind you. The census faces similar challenges -- they work hard to inject noise into their public data so you can't draw conclusions about individuals. But the more noise you introduce, the less useful the data is for, e.g., measuring racial injustice. https://www.census.gov/programs-surveys/decennial-census/decade/2020/planning-management/process/disclosure-avoidance.html
And if you think this is bad in the US: how many Cote d'Ivoire mobile phone users do you think consented to this anonymized data release to academics, a year or so after the end of a civil war? https://arxiv.org/abs/1210.0137
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