Many trading platforms still allow trading. And there's no real reason not to, except to protect the hedge funds that fucked up.

Edit: And I just found out my platform (Binck) doesn't accept trades anymore.

Edit: Apparently they do accept trades, but only if your limit is close to the current price. I was increasing mine because it wasn't executing at the lower price. Eventually I did get in at the lower price. We'll see where this goes.