That also maybe a reason why they are getting addicted to gambling because they have their smartphones at their hand so they may be interested to make some money through gambling but they are not going to have lot of money to spend for gambling so they even they get addicted to ot they may not much affected in terms of economically.
Well technology has its good and bad effect, not to mention all inventions of science has its boon and bane. Its on the person who is using it to decide how to use them and what to take advantage of or let the bad things take over them. Considering young people, I dont expect someone from a middle-class family to be having cash always at hand unless they are already in a job, in which case nobody is going to judge them or they are coming a rich family with a lot of money to "waste". But since they are adults they are responsible for their own money.
Either way it always the rich remain rich and poor remain poor. So even if they do waste gambling, the only people who are in profit are the casino owners and not the players.