> You're being a dick.
I'm being mature, and there is an important distinction though not mutually exclusive.
If OP wanted to know more they could ask, and they didn't so I was right in my initial assessment regardless of how others feel.
I would start with google keywords: "apple telemetry -site:apple.com" are a good place to start.
From memory some of the important highlights were in 2016, there was an issue with the fast-fail network code in macOS and other devices where applications would not launch locally. Apple was forced to briefly disclose the cause of the outage, which amounted to a telemetry server update, a check-in at each application launch and other actions was required and could allow apple to decide what you can and can't run in realtime without your knowledge; there were several news articles about it at the time.
There is the more recent articles about client-side scanning, which they rolled back but they largely by default upload everything to their cloud and do it there. This is good for catching predators, bad if one of those hashes they match against (which are not unique, one hash matches many potential files, an inherent property of modular arithmetic) cause a false positive, or if those hashes match material that is not illegal, but seek to censor. They don't disclose what they match specifically so you'll never know, nor will you be able to dispute or correct any mistakes.
There have been several blog posts by System Administrators about the AppleTV and other Apple devices probing/mapping their internal networks over the years, and sending data up to the cloud. Its largely been encrypted so we don't know what it is they are sending but its a lot according to netflow and wireshark. If one were to find out, and publish what they found, it would serve as proof of violating the DMCA. So it is unlikely this will ever come to light from anyone domestically in the US or its allied countries.
SDR opens a whole new avenue to approach auditing Apple devices that broadcast that data over the em spectrum, its also important since anyone with an antenna can pick that information up.
Additionally, they don't disclose how long or what specific information they do collect about you, who they share it with, and even when you tell them to not collect info, they still do it.
The higher the amount, and time, that you store information, the more likely it is going to be stolen.
