The only times I’ve had it be remotely helpful is when you want something specific that’s going to appear near the top of search results and is also likely to be buried in a bunch of irrelevant faff. Which is to say that occasionally “search for X and summarize the top result” is a useful tool but not often enough for them to front and center it like they do.
For example recipes. You can’t copyright a recipe, so recipes tend to be buried in a lot of crap that isn’t the actual recipe.
They care about companies they have less control over and a foreign adversary has more control over invading privacy, for reasons unrelated to seeing privacy as a good in itself.