It is actually true. Bitcoin is a market regulator. It is protecting all the other cryptocurrencies. When the virtual money market fell down last time, Bitcoin was the only who was strong enough to pull back the bull. Moreover, it is the most popular of the crypto. For that reason it is unique and has no competition. It was the first one to be created as well. All the others have just followed and tried to propose something. Bitcoin has more utility and can be used for purchasing purposes. It can also be used as world currency and it has no political links, just like the others. For me, it is the best now.