Smart to borrow when money is cheap if you think you can do something more profitable with it.
Also, if you have expectations that future inflation may be high, the leverage of borrowing can make sense as a hedge against your cash equivalent holdings in that scenario.
How do these AI companies turn profitable on a short enough timescale for that to make sense? Suppose a step change AI model comes out tomorrow with good enough reasoning to basically replace an employee. Businesses need to retool workflows and processes to accommodate, even if it's better. This is years away, not months. There's not enough market for the compute. And that all assumes science fiction level results, which there is absolutely no indication they will achieve.
But money has not been cheap for a while now so this is interesting. And yes, if you can do something more profitable with it, borrowing is always smart no, regardless of how cheap it is?
Put ot all on a heap on eletrically charged sand and light it on fire?
If you’re profitable and can pay it back, it’s better than equity.
If there’s any financial risk then it may not be worth the potential loss of control.