People love to find every any any cracks in Apple. Apple notes right on their site what data they share: https://www.apple.com/legal/privacy/en-ww/#accordion-label-5.... If Apple was lying, and sharing any additional data to advertisers, with privacy a pillar of their whole company, people who have uncovered that, and would be breaking news on every single news site. In regards to to "glady" sharing backups to the feds, I assume you mean, "when legally required" like any company, as Apple has been the one notably fighting against law enforcement when possible and fighting for encryption and releasing new options such as, "Advanced Data Protection for iCloud" for those who especially strong security needs who don't want their iCloud data accessible, but ok with the downsides of such security.