Why is American Football Excluded From The Olympics?

In 2021, the summer Olympics were being held in Tokyo, however American football was not a part of the event. Why is American football not included in the Olympic programs although the other three main professional sports in the United States are? Only two Olympics have featured American football. Both of these events took place in the United States of America. It was played as a demonstration sport rather than an official component of the Olympics each time. The first time American Football was included in the Olympics was in 1904, the second was in 1932.