I doubt that you are making any meaningful and/or important point OrbitalX - since the ways that guys use either term would depend upon the context inht which he is using such term... so at first there were guys who were seeming to proclaim that guys should not be investing into bitcoin unless they have a steady income (which they might have had referred to as a source of income or source income.. either way).
Something else to ponder here, I don’t necessarily agree with you can’t invest in bitcoin if you have no income source. When you consider your emergency funds include your dca amount as per the term; 3,6,9,12,18 etc months of funding/living. Technically you don’t have an income but you planned for the worst and can continue to DCA too with the emergency funds include kicking in, in your time of need.
there is always the place of knowing that different individual sources of income always differs and that and that the context of having a source of income while investing is more about setting the right structure in place that will help stay invested both in the short term and in the long term.
the first thing is that every guy be you a bitcoin investor or not should prioritize having a good stream of income, the stream of income is not just necessary just because you are investing in bitcoin. it is necessary because you can not really do without it. the income does not necessarily have to be too big before you get started in your bitcoin investment but of a necessity, you should have a source of income. if you are using your investment as your source of income, what what that will cause you is that you will be too quick to look for returns and then directly or indirectly, that will mean that you are endangering all the holding you have because in the event that an urgent need springs up, you do not have a choice rather than go touch your holding to help meet your needs.
there are things that every intentional investor should take seriously if they are hoping to become really good at their investment even though it is not that until you have a very robust source of income that you can really invest in bitcoin. getting started first is the way to go but emphasizing the need to have a good source of income which will in the long run help you reach your investment goals earlier enough is also another good thing to do.