What else do people need to know about gold? Perhaps they already have many of them in their vault
But they still dont know about bitcoin, that's why they search it

Well for me maybe there's more opportunities that bitcoin can give than gold. Bitcoin is not actually known to other people who are trying to learn or to earn in the internet and it has a huge value in crypto currency.
The stable price of gold is known in general, while bitcoin prices over time continue to fluctuate to draw attention to them. Many opportunities to get bitcoin compared to gold, so they are looking for information from the internet on every way to get it.