In America there are people who claim that taxation is theft and one should only support people with charity. I have a hard time believing that they really think a sufficient level of support for necessities is possible from charity, even more so that this funding would be enough to ensure people flourish and contribute fully to society.

Similarly, the authors seem to argue that this Democratic Citizen Science model should do a large part (maybe all) of science. At least they complain that currently citizen science is a specialised niche product. That would require an enormous amount of people donating their free time to science.

Even in a society where people are no longer forced to do paid work to survive, I have a hard time believing so many people will do this on the side. If you do it on the side, you will need many times the participants that are currently doing it full time. Science would be a hobby that requires a big time investment (especially overhead) if the participants are to be really involved and take control.