it is comparision of bitcoin with digital number because its price increases like a digital number varying thats why called bitcoin is a digital gold.
I do not agree with this comparison because:
1) There is a lot of difference in the pace with which price of gold and bitcoin grows.
2) When we compare from security point of view, it is hard to keep gold safe from hackers or thief.
3) Even from ease of convenience, these two do not match.
Yes I think this can be said because people are preferring bitcoin over gold and people are also using bitcoin as an asset as they are holding their bitcoins for future rise in price.Gold is very stable and so it gives very little or no profits.But on the other hand bitcoin is very volatile and so prices rise abd people get good profit rates.Investing in bitcoin is also a profitable deed.Bitcoin is a money making machine and one should take advantage from it.It is the topmost cryptocurrency too.