How does the free version of Cloudflare proxy track users/visitors?

Open link in next tab

Blocking Cloudflare sites with Pi-hole?

https://discourse.pi-hole.net/t/blocking-cloudflare-sites-with-pi-hole/64091

The issue I am facing: While most people want Cloudflare, I want to avoid them and block sites that use them. Is this possible? Is there a blacklist of sites that use it? I have so much trouble with them I don't appreciate being randomly blocked and my privacy invaded by them. I realize this is not a popular opinion. But that is why I use PiHole, because my views are not popular. Details about my system: A discrete x86 computer running debian, Unbound, and PiHole. What I have changed si...

Blocking Cloudflare sites with Pi-hole?

I have embedded a link into the title where a person is frustrated with Cloudflare.

I'm interested in knowing the extent of their telemetry and data collection. The user alleges that Cloudflare collects cookies from visitors when one visits a website using their proxy + CDN?

Just to be transparent: I'm not looking to use Cloudflare, I'm going to use my own setup with a VPS, however it is important to know about such technologies, especially since I work in IT.