Dormant is same with inactive account. It only differs when you have remaining balance when you became inactive because casino will slowly charge you dormant fee for holding your tokens without any activity inside the casino since they are not a custodian.

Usually, if you don’t any balance left then your account will just remain inactive which you can still use when you became active again. There’s only some minor hiccups in case you use different IP or you win big amount because casino will investigate your account since it’s just woke up while it show already “shady” behavior for them.