currently available on major streaming platforms, or are you looking for a summary of the plot to see if it's worth the watch?

Let’s decode the search intent:

Kingsglaive: Final Fantasy XV is a cinematic, action-RPG that explores the backstory of King Regis of Lucis and his struggle against the forces of darkness. The game features a unique blend of hack-and-slash combat and strategic gameplay, as players control King Regis and his allies as they battle to protect their kingdom.

Yes. It is often recommended to watch it right after starting Chapter 1 of the game to fully understand the stakes of the war. If you just like CGI action:

Moreover, “exclusive” often just means the uploader added a custom note or watermark. The video itself is identical to the public Blu-ray release.