Hello,
I see the following line on the EasyPrivacy list (https://easylist.to/easylist/easyprivacy.txt)
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! cloudflare tracking
/cdn-cgi/apps/body/*$script,~third-party
/cdn-cgi/apps/head/*$script,~third-party
The above JS is used to run Cloudflare Apps feature, blocking those will break Cloudflare Apps and there is no any apps could be run not just an apps to track user but ALL apps could not be executed under above rule.
What is Cloudflare Apps -
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https://blog.cloudflare.com/cloudflare-apps-2/
For example, if the site owner would like to add few lines of HTML to the website with the Cloudflare Apps, they could use
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https://www.cloudflare.com/apps/add-html
Apps. When the apps is added, the JS under path "cdn-cgi/apps" will be included to the site. The path "cdn-cgi/apps" doesn't necessary to be a tracking one but could be payment widget or anything.
I am observing that a few sites which use Cloudflare Apps will contain a similar path "cdn-cgi/apps", this path is nothing related to the content it is up to the site owner who decided to add what they want using this feature.
Some other site owner also complained here that the site broke because of this rule - https://github.com/uBlockOrigin/uAssets/issues/12196