Actually bitcoin is more valuable and most famous coins among all crypto coins thats why is consider as a king. The title of king is given to all those materials which are more stronger and have a power that whenever they change then they will alter the value of other things too. Just like Bitcoin when Bull or bear run initiates then as the price of bitcoin changes so in same direction the price of altcoins and other coins also changes.

Bitcoin can also be used for buying and selling of materials like that of fiat currency but other coins does not possess same ability as bitcoin. As the time passes the value of bitcoin become more dominant while other coins remain in same situation or either completely loss their higher value due to Volatility and less demand.