That's got to be worth something, since Alphabet is a $1.7T company mostly on the strength of ads associated with Google search.
GPT is very useful as a knowledge tool, but I don’t see people going there to make purchasing decisions. It replaces stackoverflow and quora, not Google. For shopping, I need to see the top X raw results, with reviews, so I can come to my own conclusion. Many people even find shopping fun (I don’t) and wouldn’t want to replace the experience with a chatbot even if it were somehow objectively better.