In economic term, investing is purchasing something of a value, and not consuming it today, but at later days, in order to create wealth.
By purchasing assets or something of value, the idea is that in the future, they can be sold at a higher price for profit.
According to CNN, a major news outlet, Bitcoin was the "star investment" of the decade, far surpassing stocks, bonds, commodities, and fiat currencies worldwide.
While Bitcoin at the moment of the news, isn't anywhere near that $20,000 price, but if not considering its price dive and sudden volatility, the cryptocurrency is enough to make smart investors turn from rags to riches.
Because of this reason, and others that include the increasing adoption, its transparency and privacy, Bitcoin dominated more than traditional investments.
In comparison, the U.S. stock market is considered the strongest in the world. $1 spent in American stocks at the start of the decade would reportedly be valued at just $3.46 in 2019. $1 invested in a 30-year U.S. treasury bond over the same time period would only be worth $2.08.
Gold on the other hand, topped the 2010 commodity, aside of Bitcoin. $1 gold investment in 2010 can worth $1.34, while crude oil would equate to 74¢.