Apple's cooperation with PRISM[0] is well documented[1], but if you want to find the particularly damning details you'll need to do your own research. The dust has settled since the Snowden revelations, and many mentions of the program have been sterilized.
> Also how they are different from any other tech company?
It's not. But the claim that Apple puts extra effort into protecting you from your government is comical, especially if you live in a first-world country. It's also a false dichotomy, since there are definitely more secure devices you could be using. They're just not being manufactured by the largest, most valuable companies in the world.
> My MacBooks security keys are not trivial to acquire because they aren’t in icloud.
That is indeed what the US would like you to think. It's no coincidence that Macbooks force you to use NIST-designed crypto for all of their services though, and if you've got a healthy degree of skepticism towards the same institute that backdoored Dual_EC_DRBG, it's safe to assume the rest of these ciphers are also vulnerable to differential cryptanalysis. Or just take what the NSA says at face value, that certainly won't cause any problems in the future. /s
> But what do 5 eyes have to do with Chinese users?
Also nothing, they have their own bespoke surveillance program since China cannot cooperate with the US like Britain or Canada can. In lieu of being able to break their encryption, China demanded that all of Apple's domestic data get stored on domestic servers. While Google, Microsoft, Yahoo and every other big tech company shied away from that kind of compliance with a known abuser of human rights, Apple happily complied with the request.
[0] https://www.theguardian.com/world/2013/jun/06/us-tech-giants...
[1] https://web.archive.org/web/20130609061546/https://www.culto...