How? With that argument, neither Facebook nor any other ad networks would already be dead since Google basically owns the space already, but they are not, they are also pulling in huge profits, just not as huge as Google, but they are still well off.
In a high growth business there is no stable static strategy. Staying the same is functionally equivalent to shrinking, in terms of scale effects and relevance, as the rest of the market dwarfs you. As long as you keep growing, you can keep relevant.
If facebook had a $1tn ad business and Google still had $200bn, would Google's business actually be the same as it is now? Would they still be able to hire the cream of graduates? Would they find it as easy to replace lost business from natural attrition with new clients? Would they find it as easy to launch new ad products and get attention for them?
The premise of this discussion is static revenue, but you can't assume that. You'll have to work harder and harder just to stand still, until it becomes unsustainable. You might be able top sustain a business by focusing on a niche specialist market segment, but at that point you're not recognisably Google anymore. As for greed, that's an incredibly naïve way to view it. Nobody creates a long term business plan that aims for irrelevance.
Somebody in the online ad space is going to eat that conventional ad revenue, or "build that value", or whatever we want to call it. If it isn't Google it will be Facebook, or Twitter, or Apple, or Tiktok, etc.
What happens to Google if Facebook has a $1tn online ad business in 10 years time, and Google's ad business is still 'only' worth their current $200bn?
This is absolutely about survival. In a super high-growth industry, you grow or you die.