Reddit does this thing where it advertises other threads on the same page of whatever you're viewing. So sometimes the promoted content was the thing actually relevant to the search and not the current thread. And this would be fine except it's not static/deterministic. The promoted content usually changes between when it's indexed and when it's accessed at a later time - so the thing that made it relevant to the search often isn't there anymore. So you have to either view the cached paged if available, go back and try different results, or refine your search.
They do now and the first thing they want to do is to sell their content to AI labs for millions/year.
It's kinda on us to ensure that it's only in the interregnum that we have the morbid and dysfunctional symptoms.
It's not a lot of sites (yet), but it's making the web get smaller, and worse, it's affecting the most useful and interesting parts of the web more than the commercial stuff.