Is it ethical to charge for work done by an AI?

https://www.abajournal.com/web/article/the-fate-of-billable-hours-is-in-ais-hands

The fate of billable hours is in the hands of artificial intelligence

… If AI is capable of doing tasks in seconds that once took hours or days, then law firms are faced with a dilemma: continue depending on that timer, which will be cut significantly; or find alternative billing methods that account for the tasks done, rather than the time that it takes to do them.

Within five years, predicts Mathew Kerbis, the founding attorney at Subscription Attorney in Deerfield, Illinois, which offers legal advice and services to clients, the only way to profitably bill time via traditional billable hours in light of AI advancements will be to charge thousands if not tens of thousands per hour.