US will ban Wall Street investors from buying single-family homes

Rent income is not wages, that's the critical part you're mistaken. Income and wages are not the same thing. Rent income is as much wages as Elon Musk selling stocks is to him, or a bank making income on interest payments. Renting is a business, it's income is business revenue, not wages.

There is this terrible view that landlords are "just like you and me, hard working regular people" - not that it's false, but so are the people that own mom & pops shops, or a local subway franchise, they're all business owners making business profits, not wages.

Business practices that harm the public should be regulated and curtailed. With taxis for example, the medallion system was used to limit the number of Taxis in operation. Similarly, not only should an individual be limited to (directly or via an ownership/shareholder interest in a company -- even with them or their family) a reasonable number of properties, but the number of rental properties in an area should itself be limited. Property owners can either sell houses, or sell condos and make income via condo (regulated) condo fees.

Food, shelter, health-care/medicine should be heavily regulated, if private parties take part as intermediaries between individuals and their food, shelter, health-care, they should expect lots of red-tape and limits. Ideally, the government itself would be driving these markets directly by building and selling properties, hospitals, pharmacies, grocery stores, etc.. that's not socialism or communism. That's just common-sense capitalism, everyone, especially the richest make more money this way. not only that their money will spend better this way.

The kind of capitalism we have now is a short-sighted parasitical money-grab. The kind where if fully realized, you'll build your own mansions and sky scrapers but you'd be complaining about the slums and crime nearby, how you can't get good help, skilled labor, and spend a ton of money on bribes instead of paying a fraction of that in taxes.

In theory, reaganism and trickle-down economics could have worked. A rising tide does indeed lift all boats. But in reality, it's more of the "scorpion and the frog" story. In this case, landlords can own a reasonable number of decent homes and make decent income, and then diversify the money in other markets. But currently, it's a race to become the biggest slumlord or until the markets collapse again.

The tax simply redirect the unearned income to the public coffer which are either spent on public investment that further increase land value or redistributed as citizen's dividend.

Meanwhile landlords are free to construct as many buildings as they can without being penalized by higher taxes.

Empty lot, parking lots, and self storage facilities would be penalized because they wouldn't generate enough income to cover taxes on land, leading to more efficient utilization of land, as improvements are no longer penalized.

In theory this encourages a sort of spreading effect where at some point the Nth property is too expensive to buy to rent or speculate on, which naturally stops the exponential effect of making land lording your full time gig by continuously expanding the portfolio.