Borrowing money to invest in Bitcoin is not a wise move at all, in fact it is one of the fastest ways to put yourself in a trap…. Bitcoin is already volatile on its own, it does not need the added pressure of a loan with interest eating into your back.. When you borrow to buy Bitcoin, you’re not only risking your Bitcoin stack, you are also risking your ability to hold through the dips.. Instead of stacking and building calmly, you will always be under pressure to pay back, and that pressure can force you to sell your coins at the worst possible time..
I think that you are not getting the point here, it's not a wrong decision entirely to invest in Bitcoin with a borrowed money, and you first of all needs to kill that notion that you will be paying back from your Bitcoin investment, no. The terms and conditions of the loan is what's going to determine if it's suited to take an invest or not.
If you have the opportunity to take a loan of $20k that can be paid installmentally across three years with a loan interest of 0.5% or 0.6% why not? Because to the best of my knowledge, you can easily repay back that loan from your paycheck once it comes, bit by bit for three years, and you can be rest assured that Bitcoin will always outperform any interest rate attached to the loan, so what are you saying?
So as long as you are paying it back installmentally across three years or more, and you are paying it back from another source, it's an opportunity not to miss especially if you took it and buy during the dip.