I don't think the distinction is inherent in the job but in the freedom and income that are generally associated with it.
I know a number of people who would be perfectly happy as cashiers if the cashier job had the same flexibility as my programming job. And to harp on UBI again: UBI by giving extra leverage to the employee might actually turn some jobs that are currently low status inflexible drone jobs into something that people will willingly do because they will have more control.
There are plenty of people who have a love hate relationship with their job because of the inflexibility imposed on them by the employer rather than anything that is fundamentally wrong with the core activity.
I don't mean that all employers are evil, they too are constrained by the current reality.
I think the difference between job and hobby more lies with enjoyment and something that one would consider doing regardless of paycheck. Housework doesn't often reap a paycheck, but few actually enjoy it. That qualifies as work. Arts and crafts is usually a hobby, but some folks make it into a job with a paycheck. Few adults would look at being a cashier or janitor as a hobby. A small subset can be truly both - programming, for example.
I think the much bigger distinction between job and hobby isn't so much that the job is useless (as most jobs aren't quite so), but the demands it places on your life and family. You can stop your hobby to go to your kid's play, but can't always take off work to do the same. Some jobs give much less control over your lifestyle - like trucking - yet refuses to give back enough benefits to compensate. Fast food, retail, and others have other methods of not giving back. I think these are the jobs that are basically welfare in disguise.