Google does: https://transparencyreport.google.com/user-data/overview?hl=...
Apple does too: https://www.apple.com/legal/transparency/
This is why I don't use a US-based search engine.
[1] - https://web.archive.org/web/20141027143819/https://github.co...
That's not entirely true. DDG saves user searches. They don't save identifying information (IP, UA, etc.) along with the user search.
The below is directly from their privacy policy [0]:
"We also save searches, but again, not in a personally identifiable way, as we do not store IP addresses or unique User agent strings. We use aggregate, non-personal search data to improve things like misspellings."
TBC, I’m not saying they’re monitoring, just that search warrants are for tangible things, while wiretap warrants are for listening in.