Someone with low finance cannot Lump sum because he has to wait for a long time to gather up the funds before investing and that will be a terrible thing to do.
Anyone can use lump sum by supplementing it with his ongoing weekly DCA buying. Lump sum is not only for the rich because a poor investor can also lump sum. You must not use a very big amount to buy bitcoin once before you can lump sum. For example, if you are using $50 on your regular weekly DCA, if you have an extra cash from your place of work as a gift to motivate you or traveling allowance that is $200 or $300. Since it's the money that you didn't expect and no budget for it, you can use the $200 to buy bitcoin right away irrespective of the price of bitcoin at that moment. Lump sums are good because it increases your bitcoin stash faster.
The reason why we more about the DCA strategy and sometimes buying on the dip is because both of them can be carried out without hindering the other.
Lump sum and buying at the dip can be carried out by one single investor as long as he doesn't stop his regular weekly DCA to keep his bitcoin accumulation ongoing. The most important thing is that you shouldn't stop your regular weekly DCA buying, because you want to wait for the dip or gathering funds for lump sum. For you to buy at the dip, you must prepare for it by having a reserve funds available. You can lump sum when you have an unexpected funds that you don't have what to do with it, putting it into bitcoin will be a wise idea.