Gold and Silver are physical assets, so when we create digital derivatives of them this is much easier to manipulate because it's all theoretical. Silver is silver and gold is gold, but crypto is constantly adapting and growing. The Bitcoin of 5 years ago is not the Bitcoin of today.
Bitcoin being a native digital asset puts it in an entirely new class. They are likely going to try to manipulate it pretty hard and I imagine they are going to faceplant directly into concreate.
This is a non sequitor. The physical nature of gold and silver does not make their derivatives any more or less 'theoretical' than Bitcoin derivatives.
What ultimately matters is how much people take personal delivery, and just like with gold and silver, the vast majority of Bitcoin and cryptocurrencies remain on exchanges, without people taking them into their own wallets.