I really liked the documentary. It's informative, easily understandable, and explains the nuts and bolts of what digital assets like Bitcoin are, and the Blockchain. That said, it should be said that currently, Bitcoin, as with most "coins", is traded like a stock on exchanges like Kraken or Coinbase for example, and therefore susceptible to market fluctuations. Case in point, a week ago as of typing this, you could buy a single Bitcoin on an exchange for $9200 USD, and today you can buy that same Bitcoin for $7941 USD. Bitcoins value is, for the most part, still determined by the USD. It's only when max output is reached, that Bitcoin will establish it's own value.