Ha, yes, I've done that at https://gigablast.com/ . The biggest problems now are the following: 1) Too hard to spider the web. Gatekeeper companies like Cloudflare (owned in part by Google) and Cloudfront make it really difficult for upstart search engines to download web pages. 2) Hardware costs are too high. It's much more expensive now to build a large index (50B+ pages) to be competitive. I believe my algorithms…
I know Google and Bing both use weird data-structure like BitFunnel
https://www.microsoft.com/en-us/research/publication/bitfunn...