[Combine]subscribe method

I know publisher has a method subscribe(_ subject: Subject)

let arrPublisher = [1,2,3,4].publisher
let tester = PassthroughSubject<Int, Never>()

arrPublisher.sink { result in
    print(result)
}.store(in: &subscriptions)
arrPublisher.subscribe(tester)
tester.send(5)

why tester as a subject cant send data after publisher has subscribed it.

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