I'm afraid a search engine so much specialized won't be able to live off ads.
like a buck or two a month billed anually I would buy without hesitation if I believed it had real value.
I usually search github directly now for these things, and it works decently well; either finding the code in the repo to which it belongs or better yet, an issue addressed by the developer.
For more open ended queries, of course, the fuzziness can be helpful. And I would assume that the typical Google search is going to benefit more from the latter approach.
(also, not sure if the GP is in some test or something, but date range and verbatim are still there for me on desktop and mobile)
For example, let's say I've seen a page on the Internet one year ago, and I remember the title and some text. Sometimes, it isn't possible for Google to return that site with any search.
There is also the perpetual search problem for computer science related material, where a major set of the search term is single letters, unsearchable symbols, or very common words.
But supposedly, Google is always getting better, even if this is not a problem I've seen before. I guess the Internet is just degrading then?