Note that contrary to advice seen in the chat, the site doesn't consider 5-card hands as 21's:

I apologize for the misunderstanding, The rules in north america I normally play IRL dictate 5 cards win.
Unfortunately the site doesn't seem to be coded in this way and we are looking into making this option available.
That being said, working on a ruleset today to post so people have a better understanding of the rules.
Thanks.