[L3viathan]

Well in a sense you are right that it is lazy, in that it would be quite a lot of work to disentangle those parts.

So they could probably do it, but it would be costly, while just releasing the TF2 code is basically free.

[lupusreal]

Don't bother with subtle disentanglement. Just take an axe to it and release a broken mess. It will be fixed and running within a month.