Sure, but why does something being illegal in the past matter without the reasoning of why it should be illegal again? There are plenty of immoral and unjust laws in the past.
It's an interesting tidbit and gives a jumping off point for the person who was asking about it to research further if they want. I wouldn't have guessed that they were illegal once, but after toomuchtodo's comment I looked it up. Now I know more!
One shouldn't assume that just because someone chimed in with a fun fact they're an expert on it or have some opinion they want to push for unless they said or implied otherwise, which toomuchtodo didn't do.
As an example: I have minimal interest in anything related to stocks or finance. My only interest here was your response seeming a bit out of place :)