homebrew is illegal?
In most cases, yes. Especially the kind of homebrew that had covers for them hosted here. Half-Life DC, for example, would be the usual copyright infringement and then probably stuff involved with trade secrets because it was leaked. Maybe we could get by saying that it's just concept art or something, but I'm not sure how much money Snowcone would want to spend on a lawyer willing to fight a large company. It's not worth it.
I hate "the man" as much as anyone else, but I'd hate to lose TCP, and this decreases the likelihood of it happening. If we leave it at that and stop talking about how awesome the covers for the homebrew stuff is, we'll be better off.