Edit: for example in France there is a minimum income benefit that everyone is entitled, one might call that 'universal basic income', then: https://en.wikipedia.org/wiki/Revenu_de_solidarit%C3%A9_acti...
The suggestion that this should be paid to everyone then clawed back from most people though taxes is rather odd. A lot of these discussions on UBI in the US seem to either be utopian or try to reinvent the wheel...
People in higher tax brackets probably wouldn't immediately benefit sure, but tax bracket isn't permanent.
So when American speak of convoluted UBI systems do they in fact just mean having an European level of welfare state?
I'm not sure what you mean by convoluted though. To me it seems much less convoluted to the existing patchwork welfare we have in this country.
I would see it to be much simpler just to take some basic level of current benefits and last resort benefits and just giving it to everyone. And then claiming it back in some way like higher income tax.
In Germany I can't get welfare, because I have too many savings. After graduating from university, I also could not get unemployment benefits because I had not earned enough when working as student.
Last time my work contract / research grant was about to expire, they said I would not get unemployment benefits, because I need to have a valid government id and my id card was expired. My still valid passport would not count. Although the grant was renewed, so I did not need unemployment benefits.
Now the grant is expiring again, and probably won't be renewed soon, so I applied again. I forgot I need to apply 3 months before expiration, so I only did it 1 month before. Now they want a copy of my work contract (which I do not have, because I seem to have lost the contract) as well as a attestation from my employer how long I have worked there (which I also do not have. The university said they will write one, but have not yet). Not sure what is going to happen now
UBI is never universal, that is just a marketing term. Where should the money come from? To finance UBI, you first have to get the money from somewhere, and for those people, UBI means just paying higher taxes.