I've always told people that they should have plenty of other things to enjoy in the real world, because that way they'll allocate less time to each entertainment activity so they can enjoy many activities. This reduces the risk of addiction to alcohol, drugs, gambling, and even depression.
But unfortunately, when people have problems at work or financial problems at home, they choose to seek out alcohol, drugs, and even gambling and isolate themselves from the rest of the world as a way to forget their problems. The effect is the opposite: they get another problem: addiction, which is a very difficult disease to cure.
Many activities can also be bad too, you can't cheat your way out of mental illnesses. There are people who get addicted to stuff like candy crush or even worse spending thousands of dollars per month buying in game currency in a game like that. You can't even win anything with it, it is fake money. Arguably it worse than gambling. With gambling you at least have some chance to win something. LOL
The emphasis is on a variety but of helpful and productive activities, it can't just be a number of any things.