You can say that about a lot of things. The car was already invented, but so many new car companies struggle. Just because a thing exists does not mean someone else can come along to immediately become successful with thing.
The question as I took it was "I can't imagine how this can work". Interpreting it as anything else is defeatism and I won't entertain that.
The question as I took it was "I can't imagine how this can work". Interpreting it as anything else is defeatism and I won't entertain that.