The mental health thing only matters if you are personally vested in your work and care about what you do. A lot of the overemployed don't. They are trying to

The mental health thing only matters if you are personally vested in your work and care about what you do. A lot of the overemployed don't. They are trying to walk a fine line and do the absolute minimal required to remain employed at each job. They also care a lot less about being fired from one job since they a fallback.