I can’t help but think that UBI would distort job markets. Let’s pick an example of a “sucky job” (and I say this as just an example, I realize these guys work hard and are vital). A garbage man. He get’s paid $42k a year because they have to find people who would be willing to do this sucky job and need to pay higher than minimum wage to do so. At some point of income, people would be willing to accept the suckiness.
Now let’s throw UBI into the world. Everyone is getting $2k a month. Now a garbage man says “I’m not gonna be a garbage man anymore, I can do something I love now, like a music teacher that pays $30k”. Now we have no garbage man and the wage would need to increase to find new people. To cover that, taxes go up. Higher taxes are a regressive solution to giving people more money.