I'll offer a counterpoint, as long as your management is effective there's plenty to love about those sorts of jobs. They are actually not bad at all other than the pay. No stress, no thinking, lots of moving around, no worry about the "bigger picture" as a founder must do. I've cleaned hotel rooms, stocked shelves at a discount store, worked the register at a grocery store, and unloaded trucks in a wearhouse. The only shitty "unskilled" job I had was due to mismanagement.
Call me lazy but I would never want the responsibility of being a founder. Seems like much too much to worry about.
I've had my share of these jobs as well, and they pay terribly. Living hand-to-mouth is a stress in itself. And I had zero dependents. Being a founder is exceptionally stressful, but don't overcompensate and pretend that life as a minimum wager is carefree.
The proof in the pudding is this: people don't move into these jobs if they have something else going on. Hospitality is a classic example - full of young people, but unless they become managers or chefs, they're out the door as soon as they can do something else. There are very few middle-aged people working on their feet in hospitality.
What you are saying is nonsensical and objectively false. I challenge you to actually talk to these people and ask them their feelings on their job. Like any job some are happy, some hate their job, some are working until they can do something else, some are in school, some are ok where they are, some are semi-retired, some are living hand to mouth (unfortunately), some work because they want to, not because they have to, some are ambivalent, some are lost, some are bored spouses, some are trying to find themselves, some are employed just until they start a family. Just like any other job.
Believe it or not some people don't actually believe the work is beneath them.
What you are saying is like "living without a wage is stressful, being a homemaker doesn't pay a wage, thus nobody is a homemaker if they have the ability to get a job." Of course that is totally untrue. People aren't exactly like you. Being a homemaker would be a nightmare for me - I hire a housekeeper and I absolutely hate kids. However, I can appreciate many people find enjoyment in that, just not me.
I was talking about work stress - I assume a founder of a successful startup probably has enough money in reserve to be able to take a pay cut, even if temporarily.
I know a few people in hospitality who genuinely enjoy it and have the ability to do other jobs - they just would rather not. I have a friend with an engineering degree, ended up hating engineering and tried several "good" jobs. Hated them all, always ended up back in food service. She finally made peace with the fact she really really likes doing food service and that's what she decided to do permanently. Another friend got a business degree, hated being in the business field, though it was too cut throat, didn't like what the felt she had to do to get ahead. Decided to dedicate her life to non-profits for a fraction of the salary she could get anywhere else but feels it's worth it. I know a guy in his 50s who washes dishes 5 days a week. He gave up his cushy office job to do that. He said office work was getting him down and he has enough money to take the pay cut. My aunt cleans offices for a living, enjoys doing so, doesn't want to do anything else. Shes an immagrant and her husband owns a very successful business. She has absolutely no monetary need to work yet she still cleans offices at night. My mom's best friend works at Kohl's, no need to, just wants to, gave up a (State) government position to do so.
I truly enjoyed most "low skilled" work I did. I also enjoy being a programmer, for the most part. There's a lot I miss about the old days though. The pay isn't one of them, of course. I really miss moving around heavy objects, oddly enough, as unusual as that may sound. Just doing so for the hell of it (gym excersing) is incredibly unappealing to me - I enjoy seeing the fruits of my labor. I don't want to sit there lifting meaningless weight, I want to be moving objects from one location to the other and have some sort of satisfaction afterwards that I met a business objective and earned my salary.
Right now I'm programmer until I can afford not to be. Programming for me is only a means to an end, to be financially independent/semi retired. I sound like someone unhappy but I actually enjoy programming, just not as much as physical labor.
Call me lazy but I would never want the responsibility of being a founder. Seems like much too much to worry about.