Just think of a leader. He can be the leader of a community or country or to a group of people. Whatever it might be, we can experience the influence of the leader over those people. Why he is a leader, because he have got special qualities and characteristics that the followers doesn't have. This is where a leader differ from the follower. The same is with bitcoin, it have got its uniqueness and the influence is found over the altcoins.
Well leader is leading because of its value and that is what bitcoin has and some altcoin dont have, though even the following altcoins are just a tip of an ice berg comparing to bitcoin and this is far different from the size of the support for this number one ranking cryptocurrency.
Simply because it has some successful history and some kind of anonymity that other coins don't have and also the feature that every coin doesn't have which is its creator is no longer controlling or developing bitcoins features rather the creator of bitcoins lets everyone do their own contribution on how they will use bitcoins like for example using it as a personal asset that no one can touch except its rightful owner and makes it as a mean of payment and others.
and because this is the pioneer in which indicates how strong the support is and how many people trusting this with their money.
We can't deny the fact that despite of thousands of alts created, still bitcoin is the leading cryptocurrency in the market.
Many have attempted to create better performing alts, and yet, people still go back to the original one.
Besides, the creator is still a mystery up until now, and we know, he's not after for the glory or fame or money.
This invention is indeed a game-changer in this generation. And in this market, everyone can participate. No boundaries.