OpenBazaar is a good alternative, though. But it doesn't rely on a privacy-preserving protocol/network like Tor. Not to mention, it uses Zcash where many people have claimed it has a backdoor (which goes against your privacy).
OB can work over Tor. As for Zcash that depends if you have trust in how the multi-party computation of public parameters was conducted. IIRC, Zcash also had suffered from two inflation bugs, it is said no one managed to exploit them, but no one's 100% certain
I seem to recall quite a bit of legitimate business was taking place on Silk Road which I guess makes some sense there was illegitimate profit ready to be spent. Unfortunately that didn't stop the legit money being stolen by the US government. And if it ain't law enforcement then it'll be the site operators themselves.
Yes, there were quite a few legal things being sold there:
