Because Bitcoin is digital gold
Let me get this straight. You're telling people that centralized, valueless, imaginary tokens are better than gold and silver, yet in order to try and trick them into believing you, you're forced to use the word "gold" in your sentence and claim that bitcoin is "gold". Talk about bad propaganda.
You're right, gold isn't even gold anymore, because the thing it used to be has been completely destroyed by Central Bank manipulation.
Bitcoin is a "digital commodity." Gold is just a shiny rock dug up from the ground.
There, fixed.
For all intents and purposes, gold and silver still work as perfectly fine as ever. The term you're looking for is rehypothecation. Lots of people who believe they're holding gold or silver hold none because the bank has rehypothecated them and given them worthless digital numbers instead, so the only people who hold any type of value are the ones who hold physical in their possession. Everyone else has been robbed by the bank or sold coupons by the bank for metals that don't exist. That's not a fault of metals, it's the fault of people trusting banks. The metals didn't rob you, the bank did.