Let me clarify, I just threw out Crawford's name as an example. Jurors aren't allowed to publically discuss trials and if this is a high profile case it's possible that means even acknowledging publically that you have jury duty (as someone could theoretically deduce what case they're on and try to influence their verdict).
Honestly we probably know too much about the situation already, Mearls probably shouldn't have said anything at all. That's the danger of sharing some info with one fan who's asked over the internet, now everyone knows more than they should - someone in this thread has already investigated and found out that there are three ongoing murder cases in that county.
If I were a judge presiding over one of those cases, I really wouldn't be comfortable with the internet taking such a close look at one of my jurors, even if it is just one thread in a tabletop RPG forum.