Why does const imply internal linkage in C++, when it doesn’t in C?

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I believe you mean

Why does const imply internal linkage in C++

It’s true that if you declare a const object at namespace scope, then it has internal linkage.

Appendix C (C++11, C.1.2) gives the rationale

Change: A name of file scope that is explicitly declared const, and not explicitly declared extern, has internal linkage, while in C it would have external linkage

Rationale: Because const objects can be used as compile-time values in C++, this feature urges programmers to provide explicit initializer values for each const. This feature allows the user to put const objects in header files that are included in many compilation units.

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