Looking at actual models for UBI costs [0], there is a solid argument that GDP will grow. Keeping in mind that we are currently seeing trillions of dollars in bailout money being pulled out of nowhere, I feel that complaints about the sources of money are a little facile; there are clearly enough money sinks to handle all of the wealth not currently trickling down. We can pay for it. More importantly, there's a clear gaping hole in tax revenue where corporations are not paying taxes that they could clearly afford, and this has gotten worse over time [1][2]. Going back to Obama-era corporate tax rates of 35% would be worth $473b; going back to Eisenhower-era rates of 50% would be worth $676b. Combine that with the idea that social programs wouldn't allow double-dipping into both e.g. Social Security and the Freedom Dividend [3] and everything is now paid for.
Sure, we don't have to talk about Sweden or Alaska. But it's really hard to take the core counter-argument here, the idea that giving money to folks is so harmful, without pointing out all of the places around the world where giving money to folks is not only not harmful, but positive.
[0] https://rooseveltinstitute.org/wp-content/uploads/2017/08/Mo...
[1] https://commons.wikimedia.org/wiki/File:Share_of_Federal_Rev...
[2] https://commons.wikimedia.org/wiki/File:US_Effective_Corpora...