Gold have been around for decades a d we now have Bitcoin, that act as alternative to gold in terms of investment, let say that Bitcoin is a dime of digital gold since Bitcoin have the components of both gold and digital currency as a feature when you take Bitcoin as a digital assets, gold long term trust have build the market capitalization we are seeing today, and as much as Bitcoin keep the current trend it will definitely surpassed Gold in market cap in near future.
Gold is a natural resources that is valuable as an asset that has been from the time of creation while Bitcoin is less than two decades old. If Bitcoin that is very new can be compared to gold that means that if Bitcoin continues with it's momentum it can surpass gold in the future. Bitcoin has some advantages over gold like in terms of security, gold is a physical asset that has the risk of carrying around because of theft while Bitcoin is a digital asset which carries no risk of theft, except through loss of wallet seed phrase. Plus Bitcoin is scarce because of it's limited supply while if gold is found in excess it's value can decrease.
Bitcoin being compared or likened to digital gold does not mean that Bitcoin will surpass gold because their value is determined by supply and demand. Bitcoin can only surpass gold when its demand is greater but how can its demand surpass gold when it cannot replace the important role of gold? In what roles can Bitcoin replace gold besides being an online investment? While the demand for gold is diverse and rich such as jewelry, practical applications or investment.
The risk of holding bitcoins is that in addition to losing your seed phrase, your bitcoins can also be hacked or stolen if you are not careful.
As for the gold supply, you forget that the gold supply has been increasing steadily every year and compared to hundreds of years ago, the gold supply has increased many times and continues to increase because mining has never stopped. But look, the demand and price of gold never decreases over time.