The founders who built Glass don't complain about cheating. Rather, the developer of https://github.com/sohzm/cheating-daddy complained of copyright infringement of his code by the developers of Glass.
They complained of license violation, not copyright infringement. There’s a big difference. The original license already granted the rights for anyone to copy the code, so the question of copyright infringement isn’t really on the table.
If you don't abide by the license terms then you don't get to copy something under the license. So breech of license means corresponding copyright infringement.