Anything you've got stored in iCloud, apple willingly hands it over to law enforcement when they're served a warrant. It happens every day, thousands of times a year. It's a fact Apple doesn't hide and they publicly state the stats every year. It's jaw dropping how many warrants they get served and how much data they hand over.
An iCloud backup is the worst. Every single thing on a backup can be cloned to another phone and can then be picked through bit by bit just as if they've got your phone in their hands.
If someone is paranoid about law enforcement - stay the hell away from iCloud.
I feel like this surprises you. Maybe I'm just wording your statement out of context in my head.
Maybe you are just confused or something. If a government agent hands an Apple employee a warrant then they are being forced to UNWILLINGLY do something. See the difference? If they were willingly doing something they wouldn't need the threat of fines and potential jail time for criminal obstruction to motivate them.
Second, an affidavits needs to present a judge with enough evidence to legitimately be able to establish 'probable cause' for the judge to issue a search warrant. Without that they are breaking the 4th amendment and oppressing someones constitutional rights will end very poorly for the prosecutor. Point is why would Apple want to protect that person? If your house is being searched by law enforcement with a warrant, its because there is an incredibly high chance you are guilty of a crime. They are there looking for the smoking gun.
Third, Apple will prepare 'anything' you've got stored in iCloud but they aren't giving you 'EVERYTHING'. The search warrant will state what they are looking for, Apple will likely have the prepared beforehand. That is specifically mentioned in that report you posted.
This is the government request based on legal processes from the United States from the report you posted.
I did not include the charts where the police called looking for a stolen/lost phone with the victim and need location data was used an attempt to return a device back to its rightful owner. I also left out emergencies, thats when government agencies contact Apple in an attempt to locate someone that is in trouble or something along those lines.
Thats 11,123 government request they that Apple was literally forced to comply with.
The first row is for device recovery which is pointless because Apple states this in their guidelines to government agencies.

The the police will need to convince the owner to unlock it.
The second row is for financial identifiers which is used most commonly in cases where someone committed credit card fraud or something.
So finally that leaves us with 5,871 suspected (at the time) criminals that Apple was court order to hand over evidence against that may have included personal data they didn't want to share.
I'm not sure what is more jaw dropping, that Apple was ordered to pull 5,871 users account data out of the 115,000,000 iPhone users in the USA. Or the fact that many people here probably think other businesses aren't in the same position.
Apple says to law enforcement agencies they will contact you personally if the government gets ordered to pull your data. They also say they will only hold onto data when requested and they can not get data back that is deleted. AKA if you get all call from Apple delete everything, photos and all. Unless you aren't a criminal....Plus it appears they try to retain all your data and just relay information unless ordered otherwise.
This stuff is in Apples guidelines for law enforcement.
I sound like a huge Apple apologist but there are a lot of people that are upset that Apple isn't just breaking the law....for the sake of criminals...I know I know slippery slope. I also don't want to sound like one of those people that says "if you don't have nothing to hide you don't have nothing to worry about". But at a certain level that is true. Some people here sound like the have an entire camera roll filled with illegal photos of minors or them dressing in drag. And if you do have something potentially illegal on your phone/icloud maybe you should quietly address that situation rather then stomping around screaming from the rooftops you are going to make yourself a 1200 dollar 'Feature Phone'. They can read my text!! So can the guy next to you on the bus.