The real reason to hold Gold and Bitcoin is human tendency to secure future or to fulfill security needs compromising present.
Due to sky-rocketing inflation, mere savings won't gonna help developing capital for person. Certain contingencies like accident, etc can shake the entire budget of individual. Hence, to stabilize one's financial position and to give catalyst impact to savings, person goes for investment in gold and bitcoin.
It's obvious that the gold and bitcoin is popular in terms of crpyto currency. Bitcoins is have a much value like gold. Many people invest in bitcoin to earn more profit but you should know the risky part is always exist in the world of crypto currency.