This will depend heavily on the use case. Generally, you want your users to be as engaged with your software as possible - meaning they actively use it as ofte

This will depend heavily on the use case. Generally, you want your users to be as engaged with your software as possible - meaning they actively use it as often as possible. If you charge per second then they will find alternatives, they’ll have to think of ways to pause and resume the software when they are in between tasks. This adds real costs and disincentives for the customer to use your product. When they compare billing to a per user license, they might perceive the per user license as lower cost.