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A key difference with something like Debian versus Facebook is profit. Debian is an open-source project supported by a community of volunteers and donors. Facebook is a corporation that banks billions of dollars. That money doesn't materialize out of thin air. It comes from advertising, your personal information and data gathering. We know what something like the Debian project is doing, we don't know what Facebook is doing. Debian and open-source projects are "mutually beneficial", Facebook only benefits Facebook.