Actually, Bitcoin has been tag Digital gold, or has been compared to Gold, is no a strenge news or statement around the world, this is because of the nature of Bitcoin and it's short term performance since invented. Bitcoin has being refered as digital Gold because, though has no physical state, but has been seen as a hedge against inflation. I think Bitcoin has proven to generate much more profit than gold within the short term it was launched. However, I believe Gold and Bitcoin are two different technology, but its comparison is just to appreciate the profit earned in short term than Gold returns. This is just my opinion.