This growth is caused by an age-old thirst for profit by ordinary people. Having seen that the new currency has taken root and shows stable growth, people rushed to buy it, wanting to earn extra money. People are buying - demand is increasing - the price is growing - more people are buying, demand is even greater. And in this way, a kind of "bubble" is inflated.
The original purpose of any currency is to help people in trading transactions. Those. money must be bought goods and services. This is the basic demand for currency.
Bitcoin community is rising due to the high rising rate of the bitcoin in the market. Though some time there is fall in the value of the bitcoin but fall give a chance to get high benefit from the bitcoin invest. The high rising value is making bitcoin more popular in the world. It attract the new people toward bitcoin, by which the community of the bitcoin is rising.