My comment was worded in generality because Google and default search engines is only one instance of the phenomenon. For instance: Microsoft or Sony paying ga

My comment was worded in generality because Google and default search engines is only one instance of the phenomenon. For instance: Microsoft or Sony paying game companies not to release games on competitors platforms. But to your specific point, this isn't (directly) about harm to users who don't know enough to care what search engine they use. It's about the number of users Google has allowing them to influence policy (privacy, tracking), technology decisions (internet standards), and the market (delisting or downlisting companies, promoting competitor pages, disabling adword accounts which can cascade to android developer accounts, etc).