Actually I think you're basically right.
The only innovation among these was whatever youtube did to be allowed to host all the pirated content, as opposed to everyone else who tried it.
Netflix will probably split into two with one company showing new movies with different pricing models. The second service will have all of the original content they made throughout the years for a low price but lack studio productions. Not sure it will be as appealing unless they can find a way to strench a production budgets while keeping quality.
Credit where credit is due. I don’t think IG would be where it is today without FB.