And making this argument is exactly why they added search engine selection. They wanted to be able to point to this tiny insignificant detail that might cost them a negligible fraction of Chrome searches and hold it up as market competition when the inevitable antitrust suit came along.
Have you ever heard of a for profit company gifting traffic to their direct competitor? It would be irrational behavior in a competitive market. If anything this is evidence of Google’s search engine monopoly and Google built the selection feature into Chrome it in furtherance of that monopoly power.