You do have a right to be alive, if you can gather the food to put in your mouth and get shelter (in most climates), and defend yourself from predators.

'Earning a living' is just some way people can do that. But you still need to defend against the predators.

When you become a billionaire you should be forced to earn a living. Prove to the world why we shouldn't eat you this year

In any good society everyone who is able should be expected to contribute something though. Even in the wild you have the right to be alive but you don't have the right to free food, shelter etc without working for it

Similarly under capitalism you're not going to be executed for not working but also unless there's a good reason you can't contribute nobody's going to work to feed you for nothing in return

Sword Logic