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Browser fingerprinting builds a profile of each visitor from details of their browser or device. It raised privacy concerns, so almost all popular browsers now block or sabotage it, which makes it unreliable. ClickGuard doesn't rely on it. It tracks unique devices with a device ID stored in the visitor's browser instead.
Browser (device) fingerprinting is used by various tracking services to create unique profiles for website visitors based on the specifics of their browser or device.
The process has raised many privacy concerns over the years both in the cyber security and consumer space. This is why almost all popular browsers either disable or sabotage the process, rendering it useless.
ClickGuard does not rely on browser fingerprinting and does not collect information that could be used to create unique visitor profiles.
See also: What is device ID in ClickGuard.