That's not just lazy, that's copyright infringement, - not to mention that they violate the GPL.

Quote from the FAQ:
" Q: Is GLUZ’s source code available?

A: No."

(was: "Q: Is LimeWire’s source code available?

A: Yes it is. LimeWire is now open source. Please check http://www.limewire.org. You can sign up and obtain the source code there." at the LimeWire FAQ)