Gold and Silver can be manipulated much more easily because they are physical assets.
Even more importantly, they can be manipulated because they do not evolve.
Gold will always be gold. Silver will always be silver.
Crypto is evolving every day.
Not really comparable to physical assets that aren't tech.
The reason gold and silver can be so easily manipulated by their digital representation is because the digital derivative has a lot of value, because they are physical assets and can't exist in the digital world, except on paper/digitally. This is a problem that crypto doesn't have because it is natively digital. In fact crypto will likely help destroy the value of paper gold/silver and pump the price of the physical version as a robust hedge.