Everything's approach has important tradeoffs: the indexing service must be run as administrator/root, and by reading the USN journal it gives users a listing of _all_ files and mtimes on the filesystem regardless of directory permissions. That means that any user who can run a file search can also see every other users' files, which includes their partial web history (since most browsers, including Firefox and Chrome, cache data in files named for the website they're from, and the mtime will often be the last visit time). If you want to avoid this, you can only switch to Everything's traditional directory-traversal-based index, which has the same performance as updatedb/mlocate, Baloo, or fsearch.

I think these tradeoffs are why there hasn't been as much interest in replicating it, combined with the fact that mlocate/fd/find/fsearch are already a lot faster in most circumstances than the default Windows search and good enough for the most common use cases (although there are certainly usecases where they're not).