I am not sure whether the user recorded the video or not but yeah some slots have this feature where you can export the video record for your game history. I assume this is also come from there.

It's unlivable that someone won $42,000,000 USDT and it's also unbelievable a casino is paying out this big amount. Congratulations to the player and also congratulations Sportsbet.io for having such a big win history on their platform