If 6.22 is used in military/banking/insurance/energy/heathcare system deep in the critical infrastructure, you don’t want attackers finding weakness in OS that is not patchable.
Making it open source seems to me like the solution to that problem, not the cause. If there is a vulnerability in DOS 6.22 people probably know about it by now. If you’re using it for something critical you probably would have an easier time patching it with full access.
If 6.22 is used in military/banking/insurance/energy/heathcare system deep in the critical infrastructure, you don’t want attackers finding weakness in OS that is not patchable.
Making it open source seems to me like the solution to that problem, not the cause. If there is a vulnerability in DOS 6.22 people probably know about it by now. If you’re using it for something critical you probably would have an easier time patching it with full access.