It's strange that Apple requires a billing address to download free apps. That was unexpected given the marketing.
It was because it was re-using the same backend as the iTunes Store which was ultimately backed by an SAP system. One that required billing addresses for all purchases (free app = $0.00 purchase).
> That was unexpected given the marketing.
An extremely small amount of people will see "privacy" and think "I can use it completely anonymously without any PII being sent".