It's a direct form of wealth transfer that requires zero force, no "putting people in cages because they can't/don't pay" nonsense.
For social spending, you do the same: print new money that's a percentage of GDP, and let citizens allocate their share to various social causes (police, fire, education, natural disaster relief, etc.).
As a concrete example, if the USA produces 15 trillion in GDP for the year, you could print 3.75 trillion for basic income, and 3.75 trillion for social income. The 3.75 trillion for basic income would be split evenly among the 330 million people, amounting to $11,364 annually per person. Each person would also have $11,364 to allocate ("appropriate") for various social causes.
Taxation is eliminated. Everyone is fed and sheltered. Growth in wealth is shared equally. Anarchists still get to keep all of the money they earn (remember: no taxation). IRS is gone. All of the tax-funded welfare programs are gone, but we've got plenty of money annually to dedicate to social welfare programs. People don't have to give money to the police if they care more about education. There's no need for a minimum wage, or tracking people's incomes. There's no downside (in terms of extra taxation and lost benefits) to working more. And on and on.
This is entirely doable today, at a purely technical/administrative level. Once robots are doing the work of the labor class, and 40% of the country literally has no jobs, and won't, ever—then it'll become a social necessity.
That's why the problems in this article don't keep me up at night: not only is the solution easy, it's far preferable and way more democratic and fair than what we have today.
For extra humanity, create a global currency, peg new money creation to the world's annual GDP, and do a basic and social income for everyone in the world equally, full stop.