[calibwam]

As this is an issue of copyright violation, I don't have any issue with this. A DMCA complaint fixes just this.

A few years ago I got an email from a TA in a subject I took the year before, that they wanted me to take down solutions I hosted on Github. However, there was no provided code in the assignment, and it was basically implementations of previously known algorithms (A* among others). Not a formal takedown request, but they said I should understand that they had to use the same assignments each year, and if I were providing solutions this could be hard. My answer was that if they are worried about plagiarism, it's better that my solutions are public, as they can be checked against.

[lmm]

It's not a copyright violation though, or at least not inherently. The statement of a homework problem is essentially an API, and if those are copyrightable then we're in big trouble as an industry.

[calibwam]

Well, we can't see the code that is taken down here, but if assignment had a lot of set up code, and the assignment was to fill in some functions, there can be a copyright violation. If these repositories only included student made code, then I agree that there is a problem.