Central
The center pays. Units consume the platform at no visible cost.
What it does to local behavior Adoption is fast because nobody is charged for it, and the platform team hears about demand as complaints rather than as orders. Units treat capacity as free, so the queue grows until the center rations by politics.
Characteristic failure Nobody local owns the cost of an agent that runs badly, so nobody local funds the evidence that would show it. The center pays for the platform and the unit keeps the savings, and the Proof band stays blank because it belongs to neither.
Chargeback
Each unit pays for what it uses, at a price the center sets.
What it does to local behavior Units economize and the platform team gets a demand signal it can plan against. The price also makes the platform something a unit can decline, and the cheapest way to avoid the charge is to build a copy or buy around it.
Named failure Units avoid the shared platform to avoid the charge, and integration dies quietly. Each unit's agents work, none of them share evidence or a halt path, and the failure that crosses two units has no owner.
Hybrid
The center funds the base and units pay for what they add on top.
What it does to local behavior The most common answer and the hardest to run, because the line between base and add-on has to be redrawn every planning cycle. Where the line holds, units get the shared halt path and evidence trail free and pay only for their own variety.
Characteristic failure The line drifts. Whatever is expensive to prove becomes an add-on, whatever ships a demo becomes base, and the funding model quietly reproduces the demo-attached anti-pattern it was chosen to prevent.