Well even if loan, loans are of different capacity, loan to be put into BTC can't be more than you can pay because even your monthly earnings into BTC have to be at certain low % so you can carry-on daily... Taking loan within amount that pay back would not be a kind of adverse threat on your daily living can do(calculated loan+risk) .. Knowing very well that BTC is just abit glorious than football bettings...
I will not support borrowing to invest in Bitcoin. The chances of it ending in trouble is high because loan have duration to pay back which you are not sure that Bitcoin will be able to have risen for you to sell and pay. Besides, buying Bitcoin with borrowed funds will steal the peace of mind that is needed to hold the investment for long term which is highly recommended for investment in Bitcoin.
It is very difficult for an ordinary individual to borrow funds whose tenor is 5-10 years, the benchmark for Bitcoin investment. The best I have seen for individuals is 3 years tenor and this is even through government intervention programs. Borrowing to invest in Bitcoin is under 3 years duration is somehow a short term duration that might not be ideal for long term investment.
It is better for the individual investor to start with what he has and possibly apply the DCA method if such amount is not what he targets as total sum to invest in Bitcoin. As time progresses, he would have been able to get inflow from other means, part of which he can continue adding into the DCA program.