Another factor can be based on the increase in price of goods and services in a country, whereby the persons salary no longer meets the requirements of the things that is needed to sustain one's self. I think that have enough effect to alter one's DCAing in accumulating Bitcoin
IMO when you say the actual salary factor it doesn't change any views on the DCA issue.
Indeed, now we are in a really difficult condition and sometimes the income we have is very sufficient with expenses that are getting more and more expensive, but when we understand and can manage those needs well, investing and doing DCA will not be hampered by that because we can adjust the budget we have from the income in a month for daily needs including unexpected needs and to be in investment.
I think we already understand and can be flexible with something like this because of course the initial concept should start when thinking that this investment is only a portion or a few per cent of what we collect from the monthly salary.