Because, in theory, Google’s search engine results are just that: simple search results...NOT some bullshit made up on the spot by a highly flawed AI algorithm. ChatGPT is frequently incorrect, and can even make up its own “facts.”
Ask it any sort of a question related to a controversial topic and all you will get will be AI = Artificial Indoctrination. Nor is it capable of changing an opinion based on any facts and/or logic you might present it with.