because gold is a precious metal and very valuable. you can sell gold in every country and gold can also be made into jewelry, gold has also existed for a long time and is considered as valuable by everyone and shows that gold is suitable for long-term savings and the value of the price is not much decrease and the increase is also very stable. while the new bitcoin appears in recent years. and only approved by people to respond. while gold has a longer process than bitcoin, and bitcoin has not been widely available at this time, perhaps only with time to prove it all.