then I'm not exactly sure when, but definitely by 2018, every answer I ever see on Google is either incorrect, answering the wrong question, or in broken English. commonly all three at once
I don't recall ever seeing a product placement, although admittedly I stopped clicking a long time ago
my educated guess is that due to some likely seo-related concern they deleted/archived/unlisted their old good quality answers in favour of newer more seo-friendly answers
it may not even be their fault, it's possible that Google's algorithm just doesn't drag up older answers from their website, but given my experience with the decision-making in the brief time I was a user there (e.g. removing the ability to add a description to questions) I suspect not
Or did it just have to perform a non-cached search and thus not only excluded said domains, but could also reorder the other results based on the current relevance, rather than cached relevance from the past that is being served to everyone else who doesn't exclude said domains?
PS: I'm blocking all ads.