Google Trends show an interesting pattern for searches related to Amazon and Ebay over the years.
In the US Amazon brand skyrocketted in searches around 2012, while Ebay brand took a hit:
In the UK the trends show a different scenario. Amazon started to gain over the market around 2015 but only during the December seasonality. The Amazon brand took over the market dominance around 2018 not so much due to increased interest in Amazon but rather due to decrease in interest in the Ebay brand:
Google Trends Infographic and Data Visualization
Tools used: Excel and Piktochart