For instance, I would consider it a much bigger privacy violation for my phone to transmit my exact location every hour than my current CPU usage every 10 seconds.
https://support.apple.com/en-us/HT203033
They do send nearly WiFi hotspots for crowd sourcing purposes but it is never in conjunction with your local IP address (which is an identifying piece of information).
Apple does not explicitly "send" the user's IP address. It naturally is accessible on their end as a result of the TCP/IP protocol. But Apple has made quite clear that it does not use that information in any way.
> However, the geod process uploads binary messages to gsp85-ssl.ls.apple.com... While it is not clear what information is contained in this binary message, it can be seen to contain the MAC addresses of nearby devices sharing the same WiFi network as the handset e.g. f2:18:98:92:17:5 is the WiFi MAC address of a nearby laptop, 70:4d:7b:95:14:c0 the MAC address of the WiFi access point.
Idk what they do with this info, and I'd much rather Apple have it than Google, but you can imagine the "God mode" they could create at Apple HQ if they were so inclined. The data is absurd... imagine what you could do if you knew where billions of people were at every second of every day for years.