It is really interesting to always see the comparisons to gold with bitcoin because in a lot of ways they are very similar but a lot of ways they are so different. Gold is a physical tangible asset and so is backed by that whereas bitcoin is not backed by anything, this is the major difference in my opinion and one that worries me when people try to think of bitcoin as a store of value.
Gold is not backed by anything either, gold is just an element of the periodic table nothing more and nothing less, however its characteristic fits very well the definition we have of money and bitcoin fulfills those characteristics in an even better way that is why bitcoin victory in the long term is assured.