

That asked about their phone SPYING on them. So I’m taking this at face value and assuming more than just targeted advertising.
Block all the IPs you want, you can’t block a Stingray
https://en.m.wikipedia.org/wiki/Stingray_phone_tracker.
Then you could also have mesh network built into devices inside your WiFi connecting to similar devices.
And my favorite for right now, and the thing I finished my last response with, your phone.
Your phone is most likely unique, between the device id, your carrier, location, other apps, contacts, operating system, etc. I personally assume most large websites could find you in minutes.
I think American Horror Story would be a good Western example. I watched each season until the first episode of Hotel. It contained a scene of sexual violence brutal enough for me and my significant other to agree to quit the show. While discussing it we realized ALL seasons contained episodes featuring sexual violence.