And why would they? It's kind of implied TX can't find that exploit. Primarily because in the past the relied on atmosphere and other open sourced works. So if they are dependent on other individuals, what on earth makes you think they will find it? In other words, TX has no power over burning the exploit as they are likely not to find it.
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Proof that there isn't?
now of course your going to respond with "What's your proof?"
And I can happily answer. The brick code is the biggest piece. Not only as far as I remember in cfw history has a product intentionally brick the users device to complete unusability. And when I say product, I mean the physical device or the code itself. Not the branches it gives. So for example, the brick code that was distrubuted through ds roms would not count as the actual devices themselves (r4s) would not brick the targets device. (despite the fact there are time bomb carts, which would only stop the cart from working and not the device)
Not only that, but they used remarkably similar methods of bricking. Which was encrypting the NAND. Which both gateway and SXOS had code for. And if your going to argue that it's a coincidence. Mind this, in all the many different ways to brick a device, NAND encryption was the one chosen. They could of completely deleted all contents of the nand. They could of removed certain files. But instead, they both choose NAND encryption. Which is why it can be believed they, SX OS, and Gateway are one of the same at this point in time. Another piece of evidence is stargatenx. When TX's website went down both TX's site AND stargate went down. Which while may be more losely connected, still has the name gate in it.