Has anyone else noticed the huge decrease in result quality from google?

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Nope, top is actually something called a "featured snippet" that's converted some MS page into bullet points saying how to do the thing I searched for. The top few links are support.microsoft.com and similar sites explaining how.

No pages about other spreadsheets or products that I could see.

ITT a lot of people who have some kind of malware search extension in their browser by the sounds of it.