It is a gamble. The interests can go up and then you could be cooked. And anyway you need to find a way to get ahead of the inflation with this money. Sure it is an opportunity but not without risks.

If you are borrowing mostly short term with intention to roll over (like US Gov does, for example), then yes, interest rate hike would fuck you over.

A safer way of doing that is to get a large, long term, fixed rate loan, and use it to buy some real asset. You know, like, say, a house. With a long term fixed rate mortgage. Has that become more popular than usual recently?

That’s backwards. The lender hopes interest rates don’t go higher (they could have invested in shorter-term investments and reinvested at higher rates), and the borrower hopes that interest rates do go higher (they have to pay less in real dollars, even though it’s the same in nominal dollars).

It sounds like you understand money!

For bonus points, at whose expense is this happening?

At the expense of people with investments in fixed return assets (cash, bonds), and those whose income does not keep pace with inflation.

If investors expect inflation to increase they can hedge that risk with TIPS.

https://www.treasurydirect.gov/indiv/products/prod_tips_glan...

These are adjusted based on CPI, which I think many intelligent observers believe to be a massively faulty metric for inflation.