Apple is no more responsible for contributing to Valgrind than you or I am. I do wish Valgrind worked properly on Mac OS X, but I don't have the right to demand

Apple is no more responsible for contributing to Valgrind than you or I am. I do wish Valgrind worked properly on Mac OS X, but I don't have the right to demand someone make it happen for me, especially for free. Same with GCC and GDB. If the GPLv3 is an unacceptable contract to Apple, they have a right not to agree to it. It's not exactly an uncontroversial license.