They also have a duty of care to their clients

> open source is not always the solution

No one saying it is. Plenty of other proprietary software vendors protect their softwaqre in customer-friendly ways.

> reverse engineering something, consumes way more energy for the problems it actually solves

When a vendor like Oracle gives you no other option to solve the very real problems that your company has with the software, the "energy consumption" can be more than worth it, even it wasn't the ideal path in the first place.