The problem with both unemployment payments and UBI is, that someone has to pay them, and (in case of the first) they stop at some time.
If you get X money per month of unemployment and X+20% to work, then yeah, if it's not a fulfilling work (and let's be honest, what work at that price is fulfilling), you'll rather stay at home. Once the "free money" dries up, people will be forced to take the shitty jobs too, but due to many failed businesses, there will be even less jobs available, and this skews the jobs-vs-workers ratio, making wages even lower.
Making it easier (and cheaper) to start a business would create more jobs, raising the price of work, and replace the shitty jobs with better one (in terms of pay and conditions).