Gold is a physical good with actual useful value. It is hugely overvalued right now, and anyone telling you to "buy gold" usually holds gold and benefits a lot from that.

Those cable "invest in gold" deals are exactly this but worse - they sell you gold more expensive then the commercial market that can never be redeemed for that price.

But it has a real cost of production that represents its relative industrial worth.

Bitcoin is valueless though. Created Bitcoins do not have any industrial value - you can't use them for anything else, even though they have a cost to create. There's no reason, if they lose value, for anyone to buy them from you - whereas with gold if you sit on it long enough, it will become valuable when someone needs gold for some type of industry at minimum.