Bitcoin is often referred as "digital gold" due to it scarcity and decentralized nature.because their will only be 21 million Bitcoin in existence which gives it scarcity and makes it resistant to inflation.this limited supply to achieve through a process called mining,where new Bitcoin are created at a decreasing rate over time.bitcoin is decentralized because it operate on a network called Blockchain,which means it's not controlled by any central or government.similary,gold is not control by any entity.
referred, but not considered, there's a difference between the two.
In my honest opinion, I'd say bitcoin is much scarcer than gold by a longshot. Although highly unlikely, an asteroid carrying 10 trillion dollars' worth of gold could come crashing down on Earth and its existence will significantly dilute the gold's supply and value as soon as it is processed. Not to mention the fact that, at least in physics you can manufacture gold. Bitcoin on the other hand is immutable, turn the whole planet and internet upside down but there's no way we could change the 21 million supply once it is set in stone. This is apart from the fact that every 4 years the supply is getting deflated too, which doesn't really happen with gold as far as I know. So perhaps bitcoin shouldn't be called "digital gold" anymore, perhaps we should start calling gold "physical bitcoin" yeah? lol.