How will Apple, Disney, AT&T and Netflix retain streaming subscribers?

(Reuters) - When Apple Inc's video streaming service made its debut on Friday, it came with $2 billion (£1.6 billion) worth of original programming - a feature widely considered to be the most powerful magnet for new subscribers.But for Apple TV+ and its rivals, whose monthly subscriptions are cheaper than traditional cable packages, keeping viewers is a huge challenge.Streaming providers like Netflix Inc , Apple TV+, Walt Disney Co's Disney+ and AT&T's HBO Max tout flexibility: sign up to..