When you use these datasets you pay for how much the query has to scan. For example, if you do a select on a single 8 byte column with 1 billion rows in the tab

When you use these datasets you pay for how much the query has to scan. For example, if you do a select on a single 8 byte column with 1 billion rows in the table you are paying for 8GB. Every month the first TB is free but if you go over that you have to pay $5 per TB. They are not exactly doing this for free.