Google mines that data by other people searching for that, not (only) by scraping it off sites. Yes, they also do that, but AFAIK search trends have a higher relevance than scraped suggestions.
As long as people want to know how their existing product stacks up against another product they have heard of before, "<existing product> vs <other products>", will be searched and appear in the autocomplete.
This approach breaks down tough for newer products, ot if you want to find the best product by quality, not just popularity.
As long as people want to know how their existing product stacks up against another product they have heard of before, "<existing product> vs <other products>", will be searched and appear in the autocomplete.
This approach breaks down tough for newer products, ot if you want to find the best product by quality, not just popularity.