https://www.apple.com/legal/privacy/en-ww/
Heck they can collect who you associate with. I quote from the document.
"When you share your content with family and friends using Apple products, send gift certificates and products, or invite others to participate in Apple services or forums, Apple may collect the information you provide about those people such as name, mailing address, email address, and phone number. "
Historically been a big Apple hardware user but have to admit less and less. Most being replaced by Google hardware. Do carry both a Pixel 2 XL and a iPhone now as just could wait no longer for Apple to fix their products.
Replaced my Mac with a Pixel Book also for example. As well as our AirPort Extremes with Google WiFi.
I find it baffling that it is now acceptable to have poor products. The Apple that I loved for so many years NEVER settled for being good enough.