In fact, back when I used DDG I think I fell back to marginalia more often than I fell back to Google, partly because of my dislike for Google and partly because Google doesn't respect my queries - which of course is a contributing reason for my dislike for them.
Let's say 100 of the Brave employees are engineers and 50 of them work on the Chromium skin, that still leaves 50 to work on search and related efforts. If 5 of them are as good as the marginalia guy and they are allowed to work with equally clear direction, lack of interruptions and more funding, I think that could almost explain a working search engine.
Remember: In the first 20 years of Google existence (or in any 20 years of the semiconductor age until recently) Moores law had over 13 cycles. A lot of what used to be hard problems before isn't anynore.