Google thinks - accurately - that the more people use the internet the more money Google makes. It invests a fortune into making the internet more accessible through creating better browsers. There isn't anyone else willing to dump that sort of money into browser development.
It is a bit like calling a supermarket a cartel if it relies on local residents for 80% of its profits. No, the technical term is they are paying customers (although in Google's case it is complex and non-traditional because they are carrying the financial burden on behalf of the people who click on ads and there are a bunch of free riders). The odds are against a bunch of alternative customers hiding in the wings waiting to pop up; if they go away then they are just gone.
It is a bit like calling a supermarket a cartel if it relies on local residents for 80% of its profits. No, the technical term is they are paying customers (although in Google's case it is complex and non-traditional because they are carrying the financial burden on behalf of the people who click on ads and there are a bunch of free riders). The odds are against a bunch of alternative customers hiding in the wings waiting to pop up; if they go away then they are just gone.