Not an insider, but I doubt it; this was the early commercial web, and business plans just weren't that sophisticated. People were building multi-million dollar companies on things that you could write in a long lunch hour today.

Honestly, I doubt that was even Google's plan for the first years of its existence. It was more "Hey, we made this neat search thing, let's see if we can figure out a way to make money from it".

At least some people in the TWIT podcast family have repeated many times the idea that Brin or Page had at one point said early on that "advertising ruins things" and this wasn't their initial goal.

I don't know if the information is true, but I know I've heard it more than once.