Yea, there is an objective value, as in the average labour needed to produce the thing but there is also the value that people perceive. The more divorced from production people are, the more the abyss between objective and perceived value grows, this is how you get cardboard pokemon cards being valued at four figures or more.
At the end of the day, marketing is more about creating a mythology around a thing than informing people about the product.
Banks literally seize and freeze assets from people, e.g. Julian Assange.
Banks have also a track record of seizing countries international reserves like Russia, Venezuela, Iran, etc…