Why would someone purchase 3.5 billion in extremely deep ITM SPX calls?

I was looking through option flows last night and found that 3.5 billion in premiums was paid for SPX calls for 12/16/22. With a strike between 1000 and 1300. I get that normally deep ITM calls are a hedge for the downside, but this seems extreme since SPX is trading around 4400.

Link to a screenshot of the options. https://www.reddit.com/user/MordantBengal/comments/st7w2c/unusual_option/?utm_medium=android_app&utm_source=share


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