Borrow money to invest in Bitcoin does that make sense?
Not only Bitcoin but yeah Bitcoin is the case study here, every investment shouldn't be started with a borrowed money especially when you don't have another source to pay back. if you do have another source, that doesn't mean you should borrow to start, learn to start with the little you have then base on the success yield a borrow scheme could could be planned to meet up at some crucial point.
This could be aplied in bitcoin, some dip could brought about it but still not advisable unless there's an assured means to payback (as mentioned already)
Yes that is true.. let say when they start business with the little they have to watch how the market or business gradually increases, it would get to some point that after knowing more about the business knowing how much profits is to come and when you take such amount what duration can you be able to produce back this money. So as you mentioned, having multiple streams of income helps alot and you would regret of taking borrowing money to finance their business or Investment.