Robert Kiyosaki was a US citizen. I know he talked about how he used debt to become rich because he used his debts to purchase assets and not liabilities. The reason why I had to mention the country where this man comes from is because if he had come from another country, maybe an underdeveloped country, he probably would not have archived what he did archive with his debts.
He was the son of Japanese immigrants, and rather poor ones at that (well at least compared to whoever that rich dad guy is). His poor dad pushed him to get a degree and stuff like that.
It's a fact that you can actually take a loan to make an investment or purchase an asset but still don't get the expected returns due to the circumstances of the bad investment. For example, people are advised not to take out loans and invest in Bitcoin.
Well duh, Bitcoin is not a stable asset

it is profitable but it it also takes a long time to get there, and most loans do not last that long and the lenders aren't as patient by comparison. It is strictly for short-term ventures.