It's true as you said bitcoin is king, because after bitcoin price started to rise and many companies accepted bitcoin there were even countries that have legalized bitcoin and there are countries that accept bitcoin as legal tender, with the growing popularity of bitcoin and many adopting bitcoin then automatically other coins appear, but even though many other coins have sprung up, the price is still below bitcoin, and people who adopt other coins are still under bitcoin, because for now there is no other coin that can compete with bitcoin prices.