I found this on Amazon TOS:
... You may not incorporate any portion of the Amazon Software into your own programs or compile any portion of it in combination with your own programs ..
Now I'm wondering what this company is doing or Google/Bing as well. There are plenty of companies who scrape data from Amazon, eBay, Etsy or news websites, Stack Overflow, etc. and do something with it (either republish or analyse or similar).
So in the case of Amazon TOS: Would indix.com be doing something legal if they put the products data into their database? How about Google?