But Disney is not making culture, they are making entertainment for making money.
Tolkien is culture, Amazon's rings of power is not.
EDIT: sorry, misread your comment, no, not only in European cultures, it's consistent across the cultures throughout history.
White is the light, first men loved light and hated dark, in darkness lure grave dangers.
For example in African mythologies fairies are white too, pearl white to be precise.