Some folks have more obstacles than others, and of course, the greater your income over your expenses, then the more you can invest and the greater could be your chances of expediting the process of actually reaching FIRE status, and so it could make a difference if you are able to invest $10 per week, $100 per week, $1,000 per week or some other amount in terms of making meaningful progress... including figuring out how much time that you have to do it.. 30-40 years? or some shorter period? Of course, getting there faster would be nice, but you still have to work within your parameters and if you are able to improve your parameters.
Yes, whatever you said is very true and I fully agree with you. There are some people who start their journey from low income and overtime if they follow F.I.R.E path then they'll keep increasing their income overtime and may still reach financial independence in early age. Investing $10 is better than investing nothing per week and that $10 can turn into $20 or more when it's invested into a good asset like Bitcoin over the course of some years or months depending on its popularity.
The one who started investing $10 or $20 per week into Bitcoin from 2015-2016 are still in enough profit and they might reach F.I.R.E status sooner than the ones who start investing in it from today, but after 10 years the ones who invested in it during 2015-2016, and the ones who invested in it from today, both will win, and there's chance that both group of investors might be free from financial issues after next 10-20 years and they may retire earlier than their colleagues.