The perpetual licensing model, where you would pay a one time fee for the software and own that version forever, has been rapidly declining. The dominant model today is where the customer pays a recurring fee. This could be per user or per tier for a given term.
Traditional car insurance sets premiums based partly on estimated annual mileage. Pay-per-mile splits the cost in two: Base rate. Covers risks like theft, fire, or weather-related damage. Per-mile rate. A set amount for every mile driven. Mileage is confirmed through telematics devices, odometer photos, connected-car systems, or smartphone apps. Many plans include a daily mileage cap, so the occasional road trip doesn't blow your monthly total.