Google and Bing can already crawl AWS sites just fine. As long as Amazon doesn't provide any first-party search engine, just providing search engine infrastructure, I think it would be a net win for competition.
As it stands, if you want to bootstrap your own search engine, you need to base your search engine on either Google or Bing's index, or perform the herculean task of making your own crawler+indexer+search engine. If Amazon can commoditize the back end, and let AWS-hosted search engines provide differentiators late in the indexing pipeline and on the search/serving side, I think we'd see more niche search engines spring up.
As it stands, if you want to bootstrap your own search engine, you need to base your search engine on either Google or Bing's index, or perform the herculean task of making your own crawler+indexer+search engine. If Amazon can commoditize the back end, and let AWS-hosted search engines provide differentiators late in the indexing pipeline and on the search/serving side, I think we'd see more niche search engines spring up.