But yes, anyone can invest through any method, can invest with any source of income. But it is better to invest by deciding which one will be good for his portfolio. Because if a person invests today and has to sell it after 2 days, it will never be good for him.
I think that you are wrong here brother, am talking about the highlighted words in your write up, you don't invest with any source of income as you claimed, that's not the best way to invest in bitcoin, because you can't be investing money meant for your basic needs, investment in bitcoin should only be done from our discretionary income, money left after all basic needs has been taken care of, because it's a money you can afford to lose, unlike any source of income as you claim.
you're right what he or she said is not the best way to invest in bitcoin, for the best way to invest in bitcoin is by investing only your leftover money (Discretionary income) after you must have settled your basic needs and expenses and not money meant for settling your basic needs and expenses. Because if an investor invest money meant for settling his or her basic needs and expenses trust me the investor will sell of his or her bitcoin investment at early stage of accumulation all because of investing wrongly.