My guess is they are trying to make a distinction between it being work or trade and a hobby, as if an action can constitute a livelihood, then it often has extra legal protections.

For instance, a sheep farmer who is supporting a family may have bail conditions that restrict travel, but those restrictions may allow for travel to go to look after the sheep as that is the farmer's livelihood, but the sheep farmer may not be able to get permission to travel across state to go play music with some mates.