You can't compare Webvan to Amazon.
Amazon ended up owning and operating Webvan.com.[1] The people who developed Webvan went on to develop Amazon Fresh.[2] The founder of Kiva Robotics, which was acquired by Amazon, was from Webvan. Amazon's grocery business is directly descended from Webvan.
[1] https://web.archive.org/web/20160303194049/http://www.webvan...
[2] https://www.reuters.com/article/net-us-amazon-webvan-idUSBRE...