Roku is like the tiny little company that thought it could, and now it is pretty certain it can, after filing a prospectus to go public in the US raising $100 million on a valuation of somewhere between $1 billion and $1.5 billon depending on its strike price. Prior to going public it raised $200 million in VC funds and began life as part of Netflix, who is one of those investors, along with News Corp and Viacom. Some US stock analysts were already predicting gloom and doom for Roku, because the prospectus reveals that almost a third of the views carried on the 15.1 million active accounts come from Netflix, which doesn’t pay it anything for the privilege. But…