Full Answer

A Data Tree matures through consistent, reliable collection over time. The value compounds because patterns only reveal themselves across complete cycles — a repeat purchase interval cannot be measured if the first purchase was never captured, and seasonal trends require at least two full years of unbroken data to confirm.

Pixel-based tracking is the most common cause of premature death. Ad blockers affect 31.5% of users globally, Safari's ITP caps cookies to 7 days (24 hours from ad clicks), and consent banners cause 30–50% of visitors to reject tracking. A Data Tree fed by pixels has holes in every branch. Six months of incomplete data does not become complete after twelve months — it becomes twelve months of incomplete data.

Platform dependency creates a subtler risk. GA4 enforces data retention policies, filters events through consent mode, and samples data at high volumes. If your Data Tree lives inside a platform you do not own, the platform can prune it at any time. Google has changed GA4's retention defaults, export formats, and API access multiple times since launch.

Migration is the third killer. Switching from one analytics platform to another — or from one tracking plugin to another — typically orphans historical data. The new system starts from zero. The old system's data sits in a format the new system cannot read. Two years of collection becomes two disconnected fragments, neither long enough to power meaningful analysis.

The antidote is first-party infrastructure that you own: server-side collection routing events to your own BigQuery warehouse, where retention is permanent, format is stable, and no external policy can delete what you have already captured.