If i say I'm going to a Casino that means a Casino is a place it's a noun, same with logging in to an online casino, its a site or a venue to play. But if you say I'm going to gamble, you can do that even when you are not in a Casino or an online casino, meaning gambling is a verb, its an act of playing with money at stake or something with value.
I'm with this poster!
There is plenty of times I say I'm going to the casino this weekend and
do very little gambling if any (maybe a few sports bets) We get reno deals
when it's $20 a night some weekends and I will just go for the weekend and
enjoy the resort or catch a show / eat a buffet or 2.