I agree, there is no such thing as full-security, neither in frontend nor your backend systems. What really makes the difference is the number of layers you have, but systems always can be broken. So not leaking your codebase in a readable manner is another security layer you can have. From a developer perspective, the real value of a codebase is the time you put in organize, name things (a hard part), give structure and meaning to your code, not so much the code itself as a sequence of statements. So, if your code is readable and understandable, is also easy to reuse and then it becomes a business concern because if you leak this type of code, anyone can copy & paste and reuse your components and I think business people are going to be not so happy about this. I think for this reason companies like Facebook do not leak his code in this way if they want to share those valuable assets they do it in a way they can gain some value and do not lose some competitive advantage.
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