I am not sure. If they release a feature and that drains the battery by accident, then yes, they can be forgiven. In this case, it seems they knew it would drain the battery and still released the feature. Apple did similar wuth deliberately slowing down the OS and was fined. I hope the internal training document is revealed during the trial for us to know.

https://en.m.wikipedia.org/wiki/Batterygate#:~:text=The%20investigation%20concluded%20in%20November,about%20how%20it%20throttles%20performance.

Deliberately draining battery is a "feature"? I hope that in some countries, this will be treated as a malicious activity with possible investigation from authorities. How is this different from unauthorised use of computing resources.

Right if you "test" in phones owned by your company in a test lab or at the best with employees who volunteer. No right with to test on the general population on their devices.

The app can be force stopped and then disabled.