I just tried "UnsafeVarint" in DDG and while #1 and #2 were useless COVID hits as you said, DDG #4 was the same as Google's #1 hit which was this GitHub issue:

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.