What is the reason for the second user to receive all the elements in RxSwift?

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The second user is receiving all the elements because they are subscribing to the same observable sequence as the first user. In RxSwift, an observable sequence is a stream of values that can be subscribed to by multiple observers. When an observer subscribes to an observable sequence, it will receive all the elements emitted by the sequence until the subscription is disposed of. Therefore, if multiple observers subscribe to the same observable sequence, they will each receive all the elements emitted by the sequence.