While we are busy with semantics of what poverty is and what it is not, Bitcoin have crossed $100k again and there are chances it will go higher. Perhaps we could also figure out how to make good use of the time we are in to buy more Bitcoin now that there seem to be a minor consolidation around the $100k price area. If there is any time to take buying Bitcoin seriously, now is the time because the price is still fairly low compared to when US and other countries that are considering making Bitcoin their reserved currency, will start buying Bitcoin, that is if they were not just being politicians when making those fine pronouncements. Nevertheless, we can never go wrong by buying more Bitcoin and expanding our portfolio.
Can you buy Bitcoin with empty pockets? Of course you should have some discretionary income available to make some purchases. Some people don't have because they're so poor and cannot afford investing in Bitcoin even at any price it gets.
For me I think poverty is a mental shortcoming concern and not actually a financial shortcoming concern. The moment you start filling your mind with optimism for riches, you'll see opportunities to get rich surrounding you and taking advantage of them ensures better financial condition and with a better financial condition, you can invest in Bitcoin consistently and hold for a longer time. It's pertinent you work on your finances first(which includes mindset upgrade to optimism for riches), so you can enjoy your investment journey with little or no setbacks.
The first step in Bitcoin investment is consenting to become an investor, then you can go work on your finances(this might take some time and you can learn a trade or soft skill in the process) if you've none, achieve a steady supply of income and with proper planning execute your dream of becoming an investor into Bitcoin.
Poverty is never an excuse not to invest in Bitcoin as long as you're alive and healthy.