Microsoft had the leading desktop operating system in the 90s that allowed millions of ordinary people to start using computers for the first time, yet their browser bundling was considered problematic.
Bell telephone allowed you to talk to people across town and across the country in real time. People love talking to their far away friends and relatives! But they were simultaneously providing this futuristic service and harming consumers with their anti-competitive practices and monopoly pricing.
It's possible for Amazon to both be providing a great service to you and me and be harming consumers with priority placement of Basics products and even harming competitors by abusing their access to product metrics in deciding what Basics products to make.