"One glaring problem with allowing this program to exist for any extended period of time is that, unless it is privately funded, it would be too expensive to maintain and would require substantial tax increases across the board.
The group’s page even admits that, saying, “there’s a number of ways to pay for guaranteed income, from a sovereign wealth fund in which citizens benefit from shard national resources like the Alaska Permanent Fund, to bringing tax rates on the wealthiest Americans to their 20th century historical averages.”
I think it part of it may have been related to how high taxes might have to be made and it would be damn near impossible to pass those level of taxes. It couldn't be done souly city by city I don't think otherwise wealthy would flee the city to avoid the taxes levied - at least that woulf be a concern of mine.