The Millennium Problems list in math was created in 2000, hence the name. There is a $1 million prize for solving any of the problems. Creating this list is just someone's idea of listing problems of equal importance. The name doesn't fit and it's just a list.

Seemingly anyone can take an unordered list of things and slap "periodic table" on it even if it doesn't have any periodicity.

Now you can enjoy one man-week of rage across the remainder of your life as you won't be able to unsee it. You're welcome