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If they are in that situation which they struggle to meet their daily needs better for them not to invest on Bitcoin yet. Its not good for anyone to sacrifice their basic needs just to invest on Bitcoin since at the end they still not going to succeed since they are struggling any any bad market movements will make them desperate to sell their Bitcoin because they afraid to lose their remaining funds.
It is not only bad market condition that will make someone who invested the money for basic needs to sell, there are many factors that will force the person to sell. In fact, from the beginning, the person will be sacrificing his peace of mind investing basic needs funds into Bitcoin because there is no way someone can have asset like Bitcoin that has one of the highest known liquidity and be starving, it is a matter of minutes not even days before he sell that investment to buy food. This is why it has been emphasized that anyone without enough funds to meet basic needs and leave discretionary income should get a job to be able to improve his finances to make investment in Bitcoin possible.
Just a little reminder, investing in Bitcoin requires that an investor must set aside fund for basic needs, and invest only from discretionary income. Part of the discretionary income have to be kept for emergency which is a way of protecting the investment and ensuring that it will not be sold when the investor have needs of money not budgeted for during the planning process.