Even though you provided some provocative details, I am still feeling that I am missing some important details.

I am presuming that your "friend" took the $60k loan some time in 2024 rather than in 2021?

3x annual income is a lot, so then his payments might have had partially depended on the length of the loan and the interest rate, and some loan require incremental payoff during the loan (such as a car payment or a house payment) and others only require minimal payment and a balloon payment at the end (such as credit card promotional loan dealios).

When the guy is in profits, such as right now with the BTC price being right around double the price at the time of the loan, it is looking like a quite great front loading situation, again presuming the loan originated in 2024 and so presuming that the loan had not yet been paid off, so the payoff might still be running until the loan is completely paid off.

If the loan originated in 2021 and if it was like 5 -6 years or more (like the kinds of loans that Saylor negotiated), then even that loan would have worked out o.k... even though there were better times to buy bitcoin both before and after 2021.

By the way, some consumer loans, such as new auto loans can be ridiculously low at the time of origin, and maybe have a 2% loan that has a 5 years duration or something like that.. but yeah, you have a depreciating car that likely is worth 1/2 as much as the purchase price after a couple of years, but yeah if you are getting cash maybe the next best one would be a home equity line of credit, but still those could be 5% or more, but they could be intended for home improvements, yet they might have liberal requirements if the person has a lot of equity in their home.  Personal loans might not be able to get under 6% or even under 5 years.. yet i know that there will  be regional variance with these kinds of matters.