Let's say somebody is making $1K/month from UBI. They might take a job that pays $1/hour because the difference between $1K/month and $1160/month is very significant.
And there'd be no reason to stop jobs from paying $1/hour because everybody already gets UBI.
Yes, this is what happens in all welfare schemes. UBI is no different from any other welfare scheme in this regard.
This is not a universally held belief, although I'll admit that (at least currently) a great majority still do think this way. I am hoping we one day evolve past this idea that one's existence must be justified through arbitrary toil. We shouldn't have to invent hole-digging jobs and hole-filling jobs purely so people can "do something" to pull their weight.
“We should do away with the absolutely specious notion that everybody has to earn a living. It is a fact today that one in ten thousand of us can make a technological breakthrough capable of supporting all the rest. The youth of today are absolutely right in recognizing this nonsense of earning a living. We keep inventing jobs because of this false idea that everybody has to be employed at some kind of drudgery because, according to Malthusian Darwinian theory he must justify his right to exist. So we have inspectors of inspectors and people making instruments for inspectors to inspect inspectors. The true business of people should be to go back to school and think about whatever it was they were thinking about before somebody came along and told them they had to earn a living.”
― Buckminster Fuller
There are real things that need to be done. As I mentioned - sweeping the street, pruning the shrubs, painting the fence. Care work. Childcare. Helping people navigate the metro. In my country there are huge shortages of police, military, and so on and so forth.
There are many many more examples.
The idea of giving someone money to do nothing is absurd in this context. Far better to just fund more paid work.
It'll always be a hard sell as a result. People want their neighbours to pull their weight. Even if it's just sweeping the street, painting their fence, whatever. Paying people to sit about watching TV is never going to work.