I find bingo very boring and do not play/watch, but I am pretty sure that cruise ships hold bingo for $$ in a showroom that is NOT IN THE CASINO. So how do they get away with this, if the rule is "only inside the casino"?
Also, I used to bet on "horse races" on the Lido deck by the pool, again "outside the casino."
It seems that the announcement stating that betting is allowed only in the casino is a lie or is misinformation.