The article also discusses and criticises a 50% effective marginal tax on working which is absolutely how an UBI smoothly transitions if funded by an income tax, and in theory the taper could be steeper still. Not harmful to earn another dollar, but not especially lucrative either.
Nothing about a UBI prevents it from being coupled with a wealth tax (possibly even a regressive one which kicks in at low levels so recipients are disincentivised to save) if the government wishes to fund it that way... and they'll need to find additional funds from somewhere.
The only difference with UBI is the subsidy itself is a lot less targeted than "financial aid for registered disabled people", so the government has to find a lot more ways to claw it back from some sections of the population. That can be sneaky and regressive, just like a non-universal income only disabled people are entitled to can be completely without income and wealth qualifications if a government wants.
Nothing about a UBI prevents it from being coupled with a wealth tax (possibly even a regressive one which kicks in at low levels so recipients are disincentivised to save) if the government wishes to fund it that way... and they'll need to find additional funds from somewhere.
The only difference with UBI is the subsidy itself is a lot less targeted than "financial aid for registered disabled people", so the government has to find a lot more ways to claw it back from some sections of the population. That can be sneaky and regressive, just like a non-universal income only disabled people are entitled to can be completely without income and wealth qualifications if a government wants.