Wouldn't car dealers raise their prices some value up to $1k because they know anyone coming in that month to buy a car also just received a $1k check from the government?
> Someone that was living paycheck to paycheck can now take a breath, buy a TV and a Netflix subscription.
Netflix may raise their prices knowing everyone has a little extra cash to spend, and that people would rather pay a dollar or two more than cancel.
If your streaming subscriptions, phone bill, and everything else goes up incrementally because companies begin to factor UBI income into their pricing, then without making any lifestyle changes, you'll see that overtime you're spending an extra $1k a month due to higher prices (of course it won't work out exactly like that, but the point is that some portion of your $1k UBI will go toward paying for things you were already buying, but that are now more expensive as a result of UBI-aware pricing.)
If you believe that companies won't act that way or that other market forces (such as increased competition) will renormalize prices, I can see the argument, but I don't buy it personally.