7 billion was the projected amount it would take to end world hunger.
Lie—that was nonsense that went viral, and immediately collapsed under scrutiny. That claim was tweeted at Musk, and when he replied saying 'explain how that would work and I'll give you the money right now', he got a sheepish response to the tune of 'well actually, it would only help, not end it, and only temporarily'.
A more recent, actual estimate, puts it closer to $93 billion. And not once, but annually.
Stop being so gullible and falling for this sensationalized nonsense just because it confirms your biases.