This is hilarious. The Discord April Fools joke was the introduction of lootboxes. Honestly, I wouldn't be surprised to see this actually happen but you can open up lootboxes in your settings as a part of the promotion, a video played to tease it.
Well, it was possible to have the video loop in the background and apparently YouTube counted all the embedded views.
Over 628 million views as of right now, which destroyed the GTA 6 trailer that is currently sitting at 183 Million views.

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This is honestly hilarious xD