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Bitcoin can make a lot of people rich, you know that bitcoin's existence, sustainability and main nature is to increase over time. as part of a $40k investment process, bitcoin doesn't make you rich quick, it boosts your awareness of yourself. and education about financial management. from there you have more opportunities to get rich.
I don't refuse what you have said about bitcoin but here, op wanted to know only one currency name that would make him billionaire by grow his capital. I agreed on the point of bitcoin made people riches even Millionaires & will keep making in future but dont think it is possible for bitcoin to make 1 Billion dollar from 40k$ only. But that doesn't mean i suggest to avoid bitcoin. So my humble request to be logical
I think that if the intention is only to choose one investment, it is clear that the choice is in bitcoin and it cannot be avoided anymore because so far bitcoin has been tested and everyone has acknowledged it.
Yes, If a single investment is the plan, the choice will be Bitcoin but despite the potential and benefit, Bitcoin presented it is still not acknowledged by everyone.
1. We have people who are still against and still don't believe in its capacity.
2. There are some people from rural areas where there's no electricity and internet.
Yes, you can't avoid the pros and cons regarding the existence of bitcoin, to be able to understand, of course, don't just accept negative information, but you also need to study it first so you can find out the benefits contained in investing in bitcoin. for this reason, people who already understand are needed to provide education so that the existence of bitcoin can indeed be gradually accepted, although of course it is not easy. moreover, as you said, the limitations of electricity and internet networks greatly affect more people who should be able to understand but are constrained by this.