A fingerprint is a combination
Many individual values are common. Their combination can become more distinctive, especially when it remains stable.
The privacy impact depends on collection, retention, linking, and reusenot merely on whether an attribute is readable.
Uniqueness needs a population
A value cannot be called unique without comparing it with an appropriate population at a relevant time.
A local test can list exposure, but it should not fabricate a uniqueness percentage.
Hashes do not remove the risk
Hashing a stable set of attributes can still create a stable identifier.
MyIPCheckup deliberately avoids generating a persistent fingerprint hash.
Defenses involve tradeoffs
Standardizing or blocking values can make many users look alike. Aggressive changes can also break sites or make a configuration unusual in another way.
Use browser protections that fit the threat model rather than chasing a perfect score.
Measure without tracking
A responsible self-test can assemble the inventory locally, explain each category, and discard it when the page closes.
The current release does not upload the assembled inventory or reuse it for analytics or advertising.