Got cutoff writing that.
Amazon is absolutely the best example of why no one can compete. Amazon's biggest competitor is Walmart, but Walmart can't truly compete. FOr one thing, Walmart is bogged down by corporate politics, and by hundreds of stores with huge rents and huge salaries.
Beyond that, though, Amazon is a tech company. Amazon has AWS, which is its most profitable business. AWS funds its retail, to a large extent. This gives Amazon the capability to lower prices dramatically and ensure no one can beat them. Amazon doesn't need a profit on any single item, or really any item, in its retail business, because of AWS. Walmart, meanwhile, does. It does badly.
Even from a marketplace perspective, it's hard to compete. Some stores, retailer or marketplace, have found niches Amazon can't really fit. But otherwise? If you're going to sell something, wouldn't you want it on Amazon, first and foremost, since it has far more daily users to tap into?
Google is kind of the same. If you start a new search engine, you need to figure out how to monetize it. If you don't want to run ads, or targeted ads, you're quite limited. Google, meanwhile, has so much data about us that it's running ads everywhere. Its search business exists for its ads, so it doesn't really need to make money serving you search results, because it serves you ads around it. They can invest those ad dollars into improvements in search, that someone without those dollars cannot.
They're just so far ahead. They have the most money. They're the only place consumers want to be. And they're who partners couldn't survive without prioritizing.