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.