An on-premise evaluation ends when the customer takes an action: uninstalling, decommissioning the VM, telling their team to stop.
Look at the incentives on their side. Ending the pilot costs them effort and removes something their team has started relying on. Not ending it costs them nothing. There is no deadline in their calendar, no invoice, and nobody in their organisation whose job it is to switch off software that works.
The asymmetry is total. You need them to act, and they have no reason to.

