Of note, the Gates don't even appear on this list. At first I thought it's because OP is only talking about farmland, but in the USA Today article the Simplot family apparently owns more than 400k acres for potato farming in Idaho, but doesn't even appear in the OP. I'm not sure what to make of the discrepancy.
Also for the sake of comparison, 240k acres is a good amount, but (as another commenter mentioned), it's also not. There are some cattle ranches larger than that. And for an example of non farm/ranch use, Bezos apparently owns over 400,000 acres in West Texas to be used for the Blue Origin launch facilities.