For what it's worth, I don't fundamentally disagree with the MMT viewpoint that you're coming from. But it's not so clear cut.
> gives free government money to financial institutions
By this, the parent means that nonzero interest rates on government debt represents "free money" that the government pays voluntarily even though it doesn't have to.
I'm not so sure. First of all, most of the institutions getting these payments hardly seem happy to be getting them, and would much rather see interest rates drop.
Secondly, the money does not come free to the recipients. It comes with a very high opportunity cost. That's exactly the point, because it's an attempt to encourage people to save money when they'd rather spend it because inflation is high.
A job guarantee sounds nice, and I do think we should be encouraging full employment without worrying about wage growth. But with a jobs guarantee, who decides what the job is in service of? The point of not having a command economy is that price signals should influence such decisions.