> The goals of the advertising business model do not always correspond to providing quality search to users
> For this type of reason and historical experience with other media [Bagdikian 83], we expect that advertising funded search engines will be inherently biased towards the advertisers and away from the needs of the consumers.
> Furthermore, advertising income often provides an incentive to provide poor quality search results.
And most importantly
> But we believe the issue of advertising causes enough mixed incentives that it is crucial to have a competitive search engine that is transparent and in the academic realm.
I think especially the last statement shows very well that they were ideologically opposed to advertisement-funded search engines.
Source: The Anatomy of a Large-Scale Hypertextual Web Search Engine, Sergey Brin and Lawrence Page. http://infolab.stanford.edu/~backrub/google.html
How was Google making a living before advertising?
> Advertising is very much its core now but it wasn't always that way.
What was its core prior to advertising? I mean a money-making core.
It wasn't. Every search engine at the time had struggled to make money. It wasn't until Google "borrowed" pay-per-click auction bidding from Overture that advertising became their focus.
https://en.wikipedia.org/wiki/Yahoo!_Search_Marketing#Patent...
I suspect they'd planned to roll out enterprise products. (You know - "the box" - like they did in Silicon Valley). That business started later (circa 2002):
https://enterprise.google.com/search/products/gsa.html
But, by that stage, their ad revenue was killing everything.