Back when I was active in academia, our publishers were reluctant to print source code or even repository links (that was largely before GitHub) but they could still share a paper source on demand. If you reference someone else's paper and want to quote some formula, it is easier and less error prone to copy rather than retype.

At that point I thought about making a TeX interpreter so one could easily "run a paper" on their own data to see if the papers claims hold. As it turned out, people often write the same formula in multiple ways and to make a TeX interpreter you'd have to specify a "runnable" subset and convince anyone to use that subset instead of what they got used to. So the idea stalled.

In a few years, publishing a GitHub link along the paper became the norm, and the problem disappeared. At least in applied geometry, people do replicate each other results all the time.