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Because it's a malleable term.

The most notable GPLv2 project is the Linux kernel, driven by a highly professional "community" of developers.

You could just have written "highly professional community of developers".

For best sarcastic emphasis I'd go for:

Highly "professional" community of _developers_

Careful, you're pushing the limits of markdown with all that sarcasm.

Is it because it's an adjective here?