This same thing was observed during the Gold Rush in California in the 1800s; extreme wealth also resulted in extreme poverty. And there's a great way to solve this: tax the land and redistribute it equally to everyone. Land can't be moved, it's something that belongs to all of us, and you can't make more of it.
Economic land is any capital that has a fixed amount, that you can't make more of. When the local governments in the Bay Area started capping the amount of buildable square feet, they greatly accelerated inequality by converting regular living space and working space into economic land, just like the real land it sits upon.
This is why economic inequality skyrocketed so much. Rentierism resulted in so much being stolen from anybody who doesn't own the land, and blocks out so many people from even having access to the economic system.
(I'm in agreement with the thesis of the article)
Read somewhere that SF spends roughly 50k$-80k$ per homeless person per year.
Taxing more doesn't solve a massively inefficient system at it's core. Just like US education, we spend more than any country on earth, why is it still bad?
Answering that question with a "if only we had more money" is a really poor argument. The CA tax fundamentals are bad, pooring more cash onto the fire will not fix that.
In addition, there should probably be changes to laws/regulations to address companies that exploit the poorest.
And, many people who are poor have persistent mental/physical disabilities, so part of that spending is because many of these people have it the hardest.
With that said, we could likely fix all of these things and significantly unequal wealth distribution would still result in a lot of poverty.
I think it's more socialist/communist motivation to seize production I don't think they care about the rich as much as control.