And then you click on a result item, reject it, hit “back” and you are not where you were in the result set. You have to scroll back to some unknowable position within infinity. Very discouraging as a user.
But the more ephemeral the content, the more one might want to save the page in a web archive, which (unfortunately) can't scroll down.
Granted, there isn't really any use in archiving ephemera like search results and frontpages other than notarizing odd patterns to show your friends or blog about, so the problem really lies in the interaction of web archival with infinite scrolling in general: comments sections, for example, can only be conveniently archived in their entirety without scraping if they're paginated and nothing is unloaded by default.
Yeah, and YouTube's comment section drives me insane, because it's one giant unthreaded infinitely scrolling list. There's no way to navigate, and if you scroll back up to the video to check something, you've just lost your place and have no hope of ever finding it again.
But DDG search results? I scroll until I find what I need, then I close the tab (it's rare to get past page 2, and yes DDG does actually group the results into numbered pages, with each page loading as it's scrolled into view).