I think it will definitely help some gambling addicts—particularly the ones that don't have knowledge of computers to migrate to online gambling.

Just like the way that clubs, bars and pubs will likely be a benefit to alcoholics.

However, it really depends on how the lockdown goes on for. I expect that most obsessive or problem gamblers can deal with around 1-3 weeks of downtime without truly recovering.

If they're forced to go more than a couple of months though, I think it will basically forcefully break their addiction by making them go cold turkey.