Bitcoin does not provide income. You may profit from your speculation, but it is not income.
Furthermore, gains are not guaranteed or even consistent. For example, people that bought in December at $19k are going to have to wait a long time just to break even.
Yes I agree to you, we get a profit but in other words it is our main income, simple because we get money from that and use for our family needs, so in short, this is our income.
For sure the income we get from bitcoin is higher than the income we get from our regular job, today price of bitcoin is very high and it can earn you huge profit for holding your bitcoin for more than 2 years, you can use bitcoin as an additional source of income because if you will join signature campaign you can earn more money than your job, bitcoin is very reliable to use as an additional source of income so use it to earn extra money and no need to leave your regular job, as it will give you chance to save money for your families future.