If that happens, it could set up a David versus Goliath battle for merchants' business. Because of the pandemic, Shopify revenue grew by 82% during the first nine months of 2020, but even as the second-largest ecommerce platform, it's still much, much smaller than Amazon. Amazon's 2020 revenue topped $386 billion, while Shopify's was $2.9 billion. It's unclear whether Amazon reentering the ecommerce platform space would result in more choices for merchants or eliminate Shopify as a competitor.