Most content startups like Reddit or Youtube are extremely difficult because of the chicken/egg problem (content/website visitors). With user generated content it’s usually free or close to free to acquire - most producers are happy with an audience and will upload themselves.

This sort of startup has three problems: a constant stream of content wrapped and delivered in a pretty multi-platform product, middlemaning the production of content by building networks of producers and talent or buying existing IP and also paying them upfront or hoping they take a gamble on your platform and get a piece visitor counts, and then also finding users for the site.

Each of those require some specialization.