I am not a lawyer, but I have a strong sense that search outputs are not the sort of thing that constitutes speech. Let's bear in mind what web search is all about.
Google search is core to its multi-billion advertising business. A search result is not an unfiltered replica of something from the public domain, but rather the subtle outcome of complex Big Data processes. Google's proprietary search algorithm is famously secret, but we do know how sensitive it is to context. Search results change day by day and from place to place. And why is this?