Gold looks pretty, has various technological uses, is legitimately rare in the real world, and has thousands of years of human valuation.

The US Dollar has hundreds of years backed by the full faith and credit of the United States (which despite expected snark, is greater than more or less anyone in the world long term).

The inventor of Bitcoin is anonymous, it is rather more vulnerable to software problems than gold or the dollar, it is difficult to exchange for other currency, has questionable legal status around the world, and it's value is disproportionally based on amateur investors (speculators).