If a loan is available with easy or interest-free and someone invests with that loan, no one becomes a gambler. Or someone has already failed. The level of risk also depends on the terms of the loan, interest rate, income stability and ability to repay the loan. But yes, for an ordinary investor, buying or avoiding Bitcoin without taking a loan is undoubtedly a safer and more disciplined than those who invest with a loan.
No matter how easy or interest free the loan can be, you will be under pressure, and when it comes to Bitcoin investment, you dont expect to sell your Bitcoin to pay your loan since you are to hold for long, therefore, there is no need to rush to invest if you dont have money right now, it is better to hustle to earn money before you should consider investing in Bitcoin. There is no need for FOMO in Bitcoin investment, once you have enough sources of income, invest in Bitcoin, if you borrow money, you will be thinking of paying back, and if you dont have another means of paying back, you will be forced to sell.
On the other hand, one does not have to be rich or completely financially secure to own Bitcoin. Because this safe situation may not be available to everyone, but it is possible to invest in that situation. The main thing for investing safety is to invest an amount from one's discretionary income or the remaining money after necessary expenses, which will not harm one's urgent expenses and financial stability. Just with this condition, anyone is initially safe to invest in Bitcoin.
Waiting to be rich before investing in Bitcoin simply means you dont want to invest in Bitcoin, if you have source of income, the best thing is to set aside some money to be investing in Bitcoin, that will be easier.