I look at it the other way. People keep comparing Amazon and Facebook to YouTube, But I don't understand why. YouTube is a single channel and is very different

I look at it the other way. People keep comparing Amazon and Facebook to YouTube, But I don't understand why. YouTube is a single channel and is very different from others because they serve video ads. Google (search) on the other hand, seems to be a much closer competitor to Amazon because lots of people search for products there and then use Google's product search to find the product they want from many different retailers. It's sort of Amazon vs. the field. Do you want to limit your search to Amazon and its platform or expand your search to every online retailer who doesn't sell on Amazon? I've found Google product search to be extremely useful in finding the right combination of trusted retailer and lowest price (including sales tax and shipping). Add to this a list of highly-ranked reviews or sites related to the product I'm searching for directly beneath the list of products, and I usually find Google a better shopping experience.