If game companies are going to do this, then they should just sell their content to Netflix or Microsoft and cash in on that licensing revenue while not having to do any of the work.
I do not understand why companies are choosing to make their own streaming services when they are just money pits that provide minimal benefit.
Keep in mind that Sega isn't just a developer, but also a publisher. They are relatively big in the strategy genre, for example, as publishers of the Company of Heroes, Dawn of War, Total War, Valkyria Chronicles and Endless Space series. They are also PlatinumGames' publisher, own Atlus, etc. pp.
This doesn't mean they are necessarily big enough to be able to successfully pull this off, but we'll see.