It is a coincidence. The issue is commands in the game clashing with the browser, an environment it was never meant to run in. Whatever command-key you want to use for shortcuts, both applications have equal claim to wanting to use them - is is about application shortcust vs. application shortcust not OS shortcuts vs. application shortcuts. It only works out because the game was developed for a different platform than the browser, which by coincidence uses a different key for commands.