The DTV is a type of tourist visa so the rules for tourism entries apply (20k cash, accommodation and proof of onward travel). Also, why do you think peole on DTVs cannot now get a bank account or many that have them are having difficulties?
Always check their website because, as Ellie says, they can differ but you should plan as if they close for Thai holidays as well as holidays in the country where they are based.
the issue is that if you click on one of the fields without a red astirisk it becomes activated and you cannot proceed without either completing the field or reseting it