LiveRamp built RampID into the dominant deterministic ID for the ad-tech ecosystem, and most identity vendors built their graph on top of it. The result: every match rate in the category is hostage to one vendor's roadmap. When RampID changes its terms, the buyer's graph changes with it. The graph absorbs whatever the next deprecation brings — the next consortium ID, the next post-cookie standard, the next universal ID — in the next continual refresh. LiveRamp is a great input. It is a bad lock-in.
When the next deprecation hits — and one always does — buyers with a single-vendor identity spine spend a quarter rebuilding. Buyers on a multi-input graph absorb the change in the next continual refresh. That's not a feature. That's the design.