An interesting takeaway from this piece is that GS is blatantly and systematically violating the terms of the MIT license, GPL, and whatever else they happen to get their hands on. I'd love nothing more than for the FSF to take them to court over it.
That's only true if they distribute the code, is it not?
> The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
That makes it sound like ripping the license out and replacing it with a proprietary one, even for purely internal use, is probably a bad idea. I don't know who'd be able to sue them for that, though, if the original copyright "owners" aren't supposed to have seen it in the first place.
Article II of the GPL has a specific exception for transferring GPL-ed software to employees to work on without letting them spread it beyond that, but I don't know how much of this that would cover.