Memes of Production

landlords primarily trade on their tenants' inability to borrow money to buy a house.

Yes, and UBI would further increase home prices. If everyone can now afford an extra $1,000 a month for mortgages then they'll be able to / forced to due to competition get a bigger mortgage and bid up prices for the home.

Same thing for rent, if everyone has an extra $1,000 a month they'll just bid up rent prices until you're back to square 1. Say there's three people in a rental market, me who pays $1,500 for rent, another guy who pays $1,000 for rent and an unhoused person. After UBI he other guy may try to rent my apartment, so I now have to offer a higher rent to out bid him, and the other guy unable to get a better apartment has to now outbid the unhoused person to keep their place. Eventually this reaches an equilibrium where I'm paying $2,500 to outbid the other guy, and there now paying $2,000 to outbid the unhoused person. The housing hierarchy remains the same, and the landlord gets all the extra money.

The problem isn't lack of money, the problem is a lack of supply and a hierarchical wage system that determines who gets that supply, UBI doesn't address either of those problems.

Increasing aggregate demand without increasing aggregate supply just leads to inflation. UBI has no mechanism to increase aggregate supply and discourages the government from doing it because they are using all their money for UBI instead of building social housing, providing food etc. and they can turn to UBI and say that's all you need now, we aren't going to supply any services.

This is why we need universal basic services backed by a jobs guarantee instead. It still gives a mechanism to raise the floor on wages and benefits, private enterprise now has to compete with the government for labor, without causing inflation because the government is actually using the labor for productive purposes, eg. Building social housing, thus increasing aggregate supply.