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.
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?