who use Closed Source Software on their Main Production Servers for their End Users and I really do not see an issue with this.
After all Open Source means that it's Open not Free and the software in question is some very specialized software that is highly developed and there is nothing else capable of doing the same job in the same time frame.
The OS and everything else in these cases is a Tool to do a job nothing more and nothing less. OS are just that not a religion.
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