UBI can be used as a replacement for existing welfare programs, but you're not pursuing arts or starting a business on it. My point was, people will still prioritize earning more money when on UBI instead of pursue their passions because it won't be enough. UBI is not a safety net, if a middle class salary person fails, they would have to work hourly lower wage work, that's why they keep working their middle class job, it isn't because they fear starvation or losing their shelter.
UBI would relieve stress for the lowest earning people, but it won't result in pursuit of passion for most people. economically speaking, because most people can afford certain things (like rent) the price of those things will go up, things are priced based on what potential consumers are willing to pay. If rent costs $1000 for a specific type of unit, but suddenly everyone on UBI can afford that easily, the landlord would raise the rent, the cost of things won't remain static when wages rise for a large portion of the population. Increased demand without increased cost is loss of potential revenue. The quality of life for people on UBI would be barely surviving, and UBI would need to increase constantly to keep people from becoming homeless or starving.
This is the "Cobra effect" embodied. It provides a perverse incentive. healthcare in the US is out of control for this reason. health care providers keep increasing cost, because the patient is not the client, the insurance company is, so long as everyone is getting insurance, the cost of care is the maximum reliably predictable pay out by the insurance company. Not increasing cost is just bad business. You will have to also force all kinds of businesses from raising prices if it can work, and even when it works UBI will result in subsidizing low-wager workers for businesses, because they'll still have to work some job to afford anything outside of food,shelter and the basics.
A practical alternative to UBI is a local tax on businesses, kind of like a property tax but this tax is based on an inverse of an assessment of wages, rent, welfare pay out and other social conditions in the area. the higher wages are, lower rent is,etc.. the lower the tax is, it might even result in a credit. An inverse of a perverse incentive like UBI. Unemployment would also be partially funded through this, the unemployed would forever get a UBI like pay out so long as they are pursuing education or work of some kind based on what is in demand in their area. Businesses get a healthy talent pool to choose from and cost of living is balanced.