Gold is like the standard of assets and reserves and that's why it's being treated as one of the safest assets where people can jump off if they see that it's no longer safe to bet for their fiat.
Gold was no longer used as a gold standard since
the Great Depression and after World War II.
Gold standard history. It was reinstalled later but was abandoned again since 1971. That metal is still considered as very precious asset for investors and we see why Bitcoin is considered as a digital gold.
It may not be the standard based on that wikipedia you've shared but as set in the minds of each individuals, it is and still one of the safest routes into investing and getting into assets.
Bitcoin is better than gold as it is portable with your private keys. You don't have to depend on banks, vaults to store your golds, log in your account and make exchange of gold to cash.
We all knew that but there are investors that want it the conservative and typical way of investing and that's through gold, jewelries, real estates, other currencies and stuff.
We know that it's a liquid asset and can be sold anytime from everywhere with just a few clicks away.
You don't have any key for your gold and will lose it if bankruptcy occurs.
As long as you have it, the value it has got remains.