Surely Apple are throwing away a lot of the value of what they just bought; does profiting from that harm their own developer tools. IMO that seems almost impossible, the only harm is to protect their eco-system from competition; ergo the reason to stop supporting other eco-systems is to harm the competition?

Couldn't they fork the project, keep everything but the name for themselves and set a single guy on maintenance; wouldn't that enhance their own developer tools just as much?