That's really not as grand as it sounds. There are so many people now, that even the crappiest of new movies can get over a million ticket sales.
Well, when you consider that the last time any album sold over 1 million copies in one week was 2015 (Adele), and the fact that Swift has sold 4 of only 7 albums that have sold over 1 million in their first week of release since 2010, it is pretty impressive. Whether you like her or not.