<b>Probabilistic attribution on iOS: useful, but know the line</b>
Fingerprinting-based probabilistic matching survives in pockets, but Apple's stance and your legal exposure make this a tooling decision with teeth.
✓ Fills the gap SKAN leaves for re-engagement and web-to-app
✓ Some MMPs offer it as an optional, region-gated layer
✗ Apple explicitly disallows fingerprinting; using it for ATT-scope cases is non-compliant
✗ Accuracy degrades as IP/device entropy drops on modern iOS
Where tools differ: responsible MMPs gate probabilistic matching to legally defensible cases and let you disable it per geo. The reckless ones make it default and quiet.
The nuance reviewers should flag: "probabilistic" is a spectrum from defensible modeling to outright fingerprinting. Read what your MMP actually does.
<b>Verdict:</b> allow it only where your legal team signs off; never as a blanket default on iOS.
<b>Best for:</b> attribution leads weighing accuracy vs compliance.
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<b>Probabilistic attribution on iOS: useful, but know the line</b>
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