This was their key victory:<p>"We’re pleased that the FTC and the other authorities that have looked at Google's business practices have concluded that we should be free to combine direct answers with web results."
The real Google's monopoly is AdSense.
Yes, there are "other" ad networks, but they mainly operate with publishers rejected from AdSense or those who serve content that is not compliant with intentionally vague AdSense TOS. Their "competitor's" revenues are smaller by orders of magnitude, and their CPMs are between 5 and 25% of what Google pays.