One click. Fork. Done.
As has been adequately demonstrated: TextMate 2, as it stands today, is and shall remain open source. Anyone can compile it or fork it at any time. Furthermore, as it's licensed under GPL3, MacroMates is legally bound to leave the current code open source, and allow anyone to compile and distribute it freely.
Now, if MacroMates decides to create value-added services on top of the GPL3 distribution, and charge for it, it does not in any way make it less an open source project.
http://www.zdnet.com/blog/burnette/gplv3-myth2-you-cant-mix-...
It comes off pretty arrogant suggesting that sniping a few bugs or features is comparable to the initial investment to write the suite. I daresay if you contributed a ton to the core it would be provided gratis to you.
Use it. Don't. Whatever.