As to the OP
I disagree with this. I think that people won’t take shitty jobs for low pay if they have their basic needs met. That 45 year old taking your order at Wendy’s isn’t doing it for personal enrichment, they are doing it because if they don’t, they are homeless and starving.
OTOH, I can think of a number of jobs that I’d be willing to do for cheap or even for free if I didn’t have to worry about making enough to survive.
OR I may just sit at home and write short stories, work on campaign settings, and run RPGs 5 days a week.
I don’t think that many would just sit on their asses all that long, and do nothing that is not productive to anyone. They aren’t going to be sitting around playing games all day, unless they only want to play the free ones. They won’t be sitting around watching TV or movies all day, unless they only access free services.
If someone wants games to play or Netflix access, they are going to have to do something that someone else finds valuable enough to pay them.
Hell, that doesn’t even mean that they won’t sit around playing games, but they may be doing so productively. Imagine that you have a job that pays pretty well, but you’d like to play World of Warcraft or something like that. You don’t have time to level a character, collect all the weapons and armor, and all that crap, you just want to log in and kill some baddies. Paying someone else to work for you in game could become a viable form of gig job.
Same with other forms of game. There are DMs on some online RPG platforms that make fairly decent money running games. I am actually a pretty good DM, and I’d probably get a decent rep enough to make money off of it, but I don’t have time for that, I have a mortgage to pay.
People also like pets, and pets cost money to buy and maintain. I would not sit on my ass all day if that meant that I couldn’t have a dog or two, I’d be willing to work enough to afford to pay for their care.
People also like drugs, especially if they have plenty of time on their hands. Want a beer? Get a job. Want a joint? Get a job. I don’t have a problem with a pretty wide slew of drugs being legalized. Not all of them, and some should come with some pretty strong warnings, but legalizing the “good” ones should lower the cost enough that people aren’t willing to spring for black market prices for the “bad” ones.
People also like to travel, and that’s not free either.
Needs are predictable and limited, if we cover those, then we don’t have to worry about people not having what they need to survive. Wants on the other hand are unlimited, and most people will work to attain the things that they want.
I would assume that a UBI would be combined with a UHC.