"lock their customers in with un/poorly documented proprietary"
They do it anyway. Google locks you in, AWS locks you in, etc. etc. Just they save boatloads of money because they don't have to pay licenses or write all that code themselves.
"trade secret protected, and/or patented technologies"
They still do it - how many patents Google & C. amasses while using open source code wherever they can use it for free and don't need to make technologies freely available? All Google algorithms are a secret or a patent, and still they can be run at that scale because open source gave them the way to cut costs greatly.
Biting the hand that feeds IT
