Apple should provide an option to opt-out of Siri "learn from app" for ALL applications. At present, this must be done individually for every app, https://www.imore.com/how-stop-siri-learning-how-you-use-app... . When you later install new apps after setting up the device, you have to remember to go into Settings and opt-out again, for every app, forever. How many people know that iOS devices will default to Siri rea…
You can just disable Siri if you're that concerned? Edit: Turns out — you can't! See the reply below.
The user is given the option to enable or not enable Siri, Apple's virtual assistant. But enabling only refers to whether you use Siri's voice control. Siri collects data in the background from other apps you use, regardless of your choice, unless you understand how to go into the settings and specifically change that,’ says Lindqvist.