Can someone please explain to me why this dataset needs to be one big file? They couldn't have broken it down? I need to download the full 1.5TB? Also, they cou

Can someone please explain to me why this dataset needs to be one big file? They couldn't have broken it down? I need to download the full 1.5TB? Also, they couldn't have simply made the data available on one of the "big-data" services? Seems to redundant and inefficient.