In 2013, we launched AmazonSmile to make it easier for customers to support their favorite charities. However, after almost a decade, the program has not grown to create the impact that we had originally hoped. With so many eligible organizations—more than 1 million globally—our ability to have an impact was often spread too thin.

https://www.aboutamazon.com/news/company-news/amazon-closing-amazonsmile-to-focus-its-philanthropic-giving-to-programs-with-greater-impact

Not cool, and kind of lame reasoning.