Ex-Google-Search engineer here, having also done some projects since leaving that involve data-mining publicly-available web documents. This proposal won't do very much. Indexing is the (relatively) easy part of building a search engine. CommonCrawl already indexes the top 3B+ pages on the web and makes it freely available on AWS. It costs about $50 to grep over it, $800 or so to run a moderately complex Hadoop job.…
Google simply has the best search product. They invest in it like crazy.
I’ve tried bing multiple times. It’s slow, it spams msn ads in your face on the homepage. Microsoft just doesn’t get the value of a clean UX.
DuckDuckGo results are pretty irrelevant the last time I tried them. There is nothing that comes close to their usability. To make the switchover, it has to be much much better than Google. Chances are that if something is, Google will buy them.