One thing for sure we should always know is that Bitcoin investment is not as the same having ownership of a business such that anyone borrowing money to invest in Bitcoin must have another secured plan of paying back that is not from his Bitcoin investment because if you borrow money to invest in Bitcoin and expect to pay back with profits you get in Bitcoin
I don’t have any problem with taking loan to invest in bitcoin, as long as you have a source of income which you will be able to pay back your loan without depending on the profits which you made from bitcoin investment. If you depend on your profit from bitcoin investment, then you might even be at loss when you are suppose to pay back your loan, and you won’t have choice than to sell because you will have to pay back your loan.
If you are having other sources of income then you can use that to pay back your loan, and the bitcoin which you are having in your wallet becomes your own, but most people investing in bitcoin do think bitcoin price will have increased before due date to pay back their loan, but things don’t really go like that.