Basic screenshot capability is a fundamental feature of a graphical desktop OS. Whether you bundle a tool (like many Linux distros) or include your own (like MacOS and Windows) doesn't really matter, but users shouldn't have to go find a tool. It's great that Greenshot and others to exist for people who want more features or a more specialized tool. But screenshots, image viewer with crop/rotate, text editor, web browser... These are things that all need to be part of the standard installation and need to work without signing up for services or other bullshit.