Thanks for sharing this information. Before now, I never knew that there were cryptocurrency before the creation of Bitcoin. Now I know better and one thing that stood out is that fact that Bitcoin is the oldest surviving cryptocurrency as the others died according to the source you gage.
As we see at the past then we will realize that the value of crypto is increasing over time and the reason behind it is the success and achievement of bitcoin. There are lots of other coins originated and are originating but as powerful bitcoin is no other coin ever proves and I think it will never be possible that other coins get much curiosity than bitcoin.
Base on the above, the caption is not out of place, Bitcoin still remain the king. It drives the entire market and also have wider acceptance which is still increasing everyday as seen from the Bitcoin dominance that is above 50% as of today.
Bitcoin acceptance is ever increasing mechanism and due to this acceptance the price of bitcoin is increasing as year passes. Next year will be halving so hopefully more people will become acceptor of this coin. As successful bitcoin is going therefore it get the name of king among all other crypto coins. Bitcoin is so dominant that it can never be hide with the success of other coins.