Privacy Has a Hoarding Problem
For a long time, deleting data could feel strangely reckless. Storage was cheap, and information was potentially valuable. The cost of keeping another year of customer records, internal correspondence, transaction histories or old documents was difficult to see, while the cost of deleting the wrong thing was easy to imagine. So companies kept it. Some of it was retained for legal or operational reasons, some because nobody was quite sure whether it could safely be destroyed, and some because of the most durable retention policy in corporate life: we might need it someday.