The original car makers did not have the problem of how to make cars profitable, theirs' was a problem of sales and marketing. Once a car was improved enough to

The original car makers did not have the problem of how to make cars profitable, theirs' was a problem of sales and marketing. Once a car was improved enough to make it affordable they received more sales. Youtube certainly doesn't have a sales/marketing problem. It has a ton of traffic every day. Here the problem is that of figuring out how to make money in the first place. It's easy to find examples of things that struggled at first only to become popular later, but at the same time there have also been products that struggled at first and still failed later.