I see this argument occasionally and it always blows my mind that people think there are careers that literally no one wants to do. With hundreds of millions of people suddenly free to do what they want to do, you're going to find a ton that will do every little job imaginable.
That said, UBI and working aren't mutually exclusive. It seems entirely reasonable to assume there will still be people working lower-end jobs to augment their UBI. If there aren't enough garbage workers, it seems only natural to also assume the pay for garbage workers would go up to entice more people to take the job.
I've always worked CS and CS-related jobs (but have volunteered at non-CS jobs), but I'd be very likely to take up some kind of monotonous-but-fulfilling service job like garbage collecting. Probably not full time, but I'd love to have the time to help out others more.
As a side note, there's probably also a lot of work to be done in transitioning these kinds of assumedly-low-interest jobs into a gig-based paradigm. I think more people would take up "shifts" in something new than committing to it as a career. Obviously there's a lot of logistical problems (training, accountability, insurance, etc) that need addressed, but that's part of the fun of figuring it all out. :)
Somebody suggesting nobody would want to do construction is probably more indicative of a person who has never had the privilege of ever building anything in their life, rather than any statement of reality. However, absolutely awful examples aside - I do think he is correct that there are plenty of jobs that indeed nobody would want to do. Toilets don't clean themselves, and won't reliably be doing so anytime in the foreseeable future. There's no fulfillment mopping up piss from somebody who thought it'd be fun to urinate all over something, just because it's not theirs.
Of course you're right that we'd see pay go up for these jobs as a result, but I think the thing that many don't consider is how relatively little money there is to go around. This is masked by scale. We see billions and think of just enormous amounts of money, yet that's of course less than $3 per American. That of course means the even more unimaginable trillion dollars is merely $3000 per American. We have so many people that it can be difficult to really intuitively grasp.
So one of the most important numbers here is the GDP per capita. The GDP being the total market value of absolutely everything produced within a nation over a set period of time. This is what makes GDP per capita so interesting. It tells us how much money each and every person would receive if the market value of absolutely every single good or service was split completely equally. And in the US it's shockingly less than $60,000.
With an absolutely huge motivation to overproduce everything imaginable, and a countless array of artificial demand being created and sated, our GDP is still less than $60k. That's not a particularly huge amount of money! And while we could debate to what degree, I think nobody would disagree that an UBI would depress overall production. So we're not even going to be getting to that $60k point, and probably not even particularly close to it.
And this amount of money needs to be used to provide a livable stipend to each and every person, and then also account for 100% of the market driven economic success for each and every individual. I'm sure you can see the problem. Exactly how much money is our janitor supposed to be earning? And where does this money come from? You have to keep in mind that when we talk about this < $60k GDP/capita this isn't "money" but rather real money that represents a share of access to a finite set of resources. In other words you can't just go above this number and call it debt - the resources that such "money" (as it would become at that point) would represent literally do not exist. It'd be like in a world of 100 with a total of 5 cars telling each and every person that they can have a car. It just doesn't work.
It would have to pay a good deal, with a pension. Generally don't think it would be enticing enough right now, which is why the turnover after the next phase in automation is a better opportunity.
That said, UBI and working aren't mutually exclusive. It seems entirely reasonable to assume there will still be people working lower-end jobs to augment their UBI. If there aren't enough garbage workers, it seems only natural to also assume the pay for garbage workers would go up to entice more people to take the job.
I've always worked CS and CS-related jobs (but have volunteered at non-CS jobs), but I'd be very likely to take up some kind of monotonous-but-fulfilling service job like garbage collecting. Probably not full time, but I'd love to have the time to help out others more.
As a side note, there's probably also a lot of work to be done in transitioning these kinds of assumedly-low-interest jobs into a gig-based paradigm. I think more people would take up "shifts" in something new than committing to it as a career. Obviously there's a lot of logistical problems (training, accountability, insurance, etc) that need addressed, but that's part of the fun of figuring it all out. :)