I put the same search into DDG and it gives me two mainsteam media articles about COVID as #1 and #2. Useless. People who defend Bing are just out of their minds.
Imagine defending a search engine by microsoft that top-ranks irrelevant articles from its own wholly-owned subsidiary, MSN. Just absolutely the worst search results anyone can imagine.
https://github.com/tensorflow/models/issues/7420
Google's #2 hit for me was blogspam at "bankoftrans [dot] com" that copied the source code for UnsafeVarint in order to game Google search results. (A growing problem others in this discussion have been complaining about.)
So Google isn't stellar for your search, either, though perhaps it was working better for you because you were logged in with your Google Account.
Like I said, I do still use Google via "!g" and "!gi" when DDG's results are garbage, but often in these cases Google's results are also junk.
Exactly what search query did you use? I just popped "UnsafeVarint" (without quotes) into DDG and it's not remotely "media articles about COVID".
I don't know whether it'll be what you want. It's clearly a long-tail result in DDG as well, but it's at least mostly programming stuff for me, and no COVID at all.
Does it work better for you if you surround the query in quotes?
EDIT: You are right, double quotes around "UnsafeVarint" improve the result. Learned something new just now. : )