In my own opinion, a $50 capital might be enough if you invest it in bitcoin because investing in bitcoin is risky, but it is profitable. As long you can manage your portfolio and make a successful trade you could earn good profit.
You must be joking. The risk -reward ratio is good with Bitcoin but with $50 there's no risk so there will also be no reward.
What can you expect? To make another 100% in a year if you're lucky? That will make you own a whopping $100 by the end of the year. Congratulations!
Your point is valid though who knows how many percentage bitcoin will able to bring after the halving time. If OP is not in rush and willing to undergo
to learning process inside this industry, holding bitcoin have a lesser risk unlike with alts that in a short span of time you can lose up to 50% or more of your initial investment.