Even though the author of this article said that this situation is the beginning of the battle to take on Amazon, my opinion is that we are still very far from becoming a threat to them. On the other hand, I think that it is vital that Walmart is showing growth in that segment, and that is showing a serious intention of being a significant competitor on the market.
https://www.forbes.com/sites/andriacheng/2018/11/15/walmarts-fight-against-amazon-is-picking-up-steam/#67b2af0d6c57