Meta isn't exactly known for keeping your data safe. Meta, like a handful of other tech companies, is primarily in the advertising business. It wants to sell personalized ads to other companies for placement on its social media platforms, tailored to you using the data it collects.
This is Meta's core business model, and it explains why the brand wants as much user data as it can get. That's without getting into the data privacy scandals Meta has been involved in over the years.